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484
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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5
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6
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7 #include <ngx_config.h>
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8 #include <ngx_core.h>
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9 #include <ngx_http.h>
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488
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10
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11 #include <gd.h>
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484
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12
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13
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14 #define NGX_HTTP_IMAGE_OFF 0
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15 #define NGX_HTTP_IMAGE_TEST 1
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16 #define NGX_HTTP_IMAGE_SIZE 2
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17 #define NGX_HTTP_IMAGE_RESIZE 3
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18 #define NGX_HTTP_IMAGE_CROP 4
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19
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20
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21 #define NGX_HTTP_IMAGE_START 0
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22 #define NGX_HTTP_IMAGE_READ 1
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23 #define NGX_HTTP_IMAGE_PROCESS 2
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488
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24 #define NGX_HTTP_IMAGE_PASS 3
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25 #define NGX_HTTP_IMAGE_DONE 4
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484
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26
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27
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28 #define NGX_HTTP_IMAGE_NONE 0
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29 #define NGX_HTTP_IMAGE_JPEG 1
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30 #define NGX_HTTP_IMAGE_GIF 2
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31 #define NGX_HTTP_IMAGE_PNG 3
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32
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33
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34 #define NGX_HTTP_IMAGE_BUFFERED 0x08
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35
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36
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37 typedef struct {
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38 ngx_uint_t filter;
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39 ngx_uint_t width;
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40 ngx_uint_t height;
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492
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41 ngx_int_t jpeg_quality;
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484
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42
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510
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43 ngx_http_complex_value_t *wcv;
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44 ngx_http_complex_value_t *hcv;
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45
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484
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46 size_t buffer_size;
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47 } ngx_http_image_filter_conf_t;
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48
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49
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50 typedef struct {
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51 u_char *image;
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52 u_char *last;
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53
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54 size_t length;
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55
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56 ngx_uint_t width;
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57 ngx_uint_t height;
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58
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510
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59 ngx_uint_t max_width;
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60 ngx_uint_t max_height;
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61
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62 ngx_uint_t phase;
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63 ngx_uint_t type;
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64 } ngx_http_image_filter_ctx_t;
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65
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66
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488
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67 static ngx_int_t ngx_http_image_send(ngx_http_request_t *r,
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68 ngx_http_image_filter_ctx_t *ctx, ngx_chain_t *in);
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484
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69 static ngx_uint_t ngx_http_image_test(ngx_http_request_t *r, ngx_chain_t *in);
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70 static ngx_int_t ngx_http_image_read(ngx_http_request_t *r, ngx_chain_t *in);
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71 static ngx_buf_t *ngx_http_image_process(ngx_http_request_t *r);
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72 static ngx_buf_t *ngx_http_image_json(ngx_http_request_t *r,
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73 ngx_http_image_filter_ctx_t *ctx);
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74 static ngx_buf_t *ngx_http_image_asis(ngx_http_request_t *r,
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75 ngx_http_image_filter_ctx_t *ctx);
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76 static void ngx_http_image_length(ngx_http_request_t *r, ngx_buf_t *b);
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77 static ngx_int_t ngx_http_image_size(ngx_http_request_t *r,
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78 ngx_http_image_filter_ctx_t *ctx);
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79
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80 static ngx_buf_t *ngx_http_image_resize(ngx_http_request_t *r,
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81 ngx_http_image_filter_ctx_t *ctx);
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82 static gdImagePtr ngx_http_image_source(ngx_http_request_t *r,
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83 ngx_http_image_filter_ctx_t *ctx);
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84 static gdImagePtr ngx_http_image_new(ngx_http_request_t *r, int w, int h,
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85 int colors);
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86 static u_char *ngx_http_image_out(ngx_http_request_t *r, ngx_uint_t type,
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87 gdImagePtr img, int *size);
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88 static void ngx_http_image_cleanup(void *data);
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510
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89 static ngx_uint_t ngx_http_image_filter_get_value(ngx_http_request_t *r,
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90 ngx_http_complex_value_t *cv, ngx_uint_t v);
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91 static ngx_uint_t ngx_http_image_filter_value(ngx_str_t *value);
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484
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92
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93
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94 static void *ngx_http_image_filter_create_conf(ngx_conf_t *cf);
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95 static char *ngx_http_image_filter_merge_conf(ngx_conf_t *cf, void *parent,
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96 void *child);
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97 static char *ngx_http_image_filter(ngx_conf_t *cf, ngx_command_t *cmd,
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98 void *conf);
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99 static ngx_int_t ngx_http_image_filter_init(ngx_conf_t *cf);
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100
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101
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102 static ngx_command_t ngx_http_image_filter_commands[] = {
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103
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104 { ngx_string("image_filter"),
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105 NGX_HTTP_LOC_CONF|NGX_CONF_TAKE13,
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106 ngx_http_image_filter,
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107 NGX_HTTP_LOC_CONF_OFFSET,
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108 0,
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109 NULL },
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110
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492
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111 { ngx_string("image_filter_jpeg_quality"),
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112 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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113 ngx_conf_set_num_slot,
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114 NGX_HTTP_LOC_CONF_OFFSET,
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115 offsetof(ngx_http_image_filter_conf_t, jpeg_quality),
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116 NULL },
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117
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484
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118 { ngx_string("image_filter_buffer"),
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119 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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120 ngx_conf_set_size_slot,
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121 NGX_HTTP_LOC_CONF_OFFSET,
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122 offsetof(ngx_http_image_filter_conf_t, buffer_size),
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123 NULL },
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124
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125 ngx_null_command
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126 };
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127
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128
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129 static ngx_http_module_t ngx_http_image_filter_module_ctx = {
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130 NULL, /* preconfiguration */
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131 ngx_http_image_filter_init, /* postconfiguration */
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132
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133 NULL, /* create main configuration */
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134 NULL, /* init main configuration */
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135
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136 NULL, /* create server configuration */
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137 NULL, /* merge server configuration */
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138
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139 ngx_http_image_filter_create_conf, /* create location configuration */
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140 ngx_http_image_filter_merge_conf /* merge location configuration */
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141 };
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142
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143
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144 ngx_module_t ngx_http_image_filter_module = {
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145 NGX_MODULE_V1,
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146 &ngx_http_image_filter_module_ctx, /* module context */
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147 ngx_http_image_filter_commands, /* module directives */
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148 NGX_HTTP_MODULE, /* module type */
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149 NULL, /* init master */
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150 NULL, /* init module */
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151 NULL, /* init process */
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152 NULL, /* init thread */
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153 NULL, /* exit thread */
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154 NULL, /* exit process */
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155 NULL, /* exit master */
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156 NGX_MODULE_V1_PADDING
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157 };
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158
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159
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160 static ngx_http_output_header_filter_pt ngx_http_next_header_filter;
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161 static ngx_http_output_body_filter_pt ngx_http_next_body_filter;
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162
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163
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164 static ngx_str_t ngx_http_image_types[] = {
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165 ngx_string("image/jpeg"),
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166 ngx_string("image/gif"),
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167 ngx_string("image/png")
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168 };
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169
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170
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171 static ngx_int_t
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172 ngx_http_image_header_filter(ngx_http_request_t *r)
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173 {
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174 off_t len;
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175 ngx_http_image_filter_ctx_t *ctx;
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176 ngx_http_image_filter_conf_t *conf;
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177
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178 if (r->headers_out.status == NGX_HTTP_NOT_MODIFIED) {
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179 return ngx_http_next_header_filter(r);
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180 }
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181
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490
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182 ctx = ngx_http_get_module_ctx(r, ngx_http_image_filter_module);
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183
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184 if (ctx) {
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185 ngx_http_set_ctx(r, NULL, ngx_http_image_filter_module);
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186 return ngx_http_next_header_filter(r);
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187 }
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188
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484
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189 conf = ngx_http_get_module_loc_conf(r, ngx_http_image_filter_module);
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190
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191 if (conf->filter == NGX_HTTP_IMAGE_OFF) {
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192 return ngx_http_next_header_filter(r);
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193 }
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194
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195 if (r->headers_out.content_type.len
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196 >= sizeof("multipart/x-mixed-replace") - 1
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197 && ngx_strncasecmp(r->headers_out.content_type.data,
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198 (u_char *) "multipart/x-mixed-replace",
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199 sizeof("multipart/x-mixed-replace") - 1)
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200 == 0)
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201 {
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202 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
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203 "image filter: multipart/x-mixed-replace response");
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204
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205 return NGX_ERROR;
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206 }
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207
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208 ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_image_filter_ctx_t));
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209 if (ctx == NULL) {
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210 return NGX_ERROR;
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211 }
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212
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213 ngx_http_set_ctx(r, ctx, ngx_http_image_filter_module);
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214
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215 len = r->headers_out.content_length_n;
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216
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217 if (len != -1 && len > (off_t) conf->buffer_size) {
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218 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
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219 "image filter: too big response: %O", len);
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220
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221 return NGX_ERROR;
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222 }
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223
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224 if (len == -1) {
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225 ctx->length = conf->buffer_size;
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226
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227 } else {
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228 ctx->length = (size_t) len;
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229 }
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230
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231 if (r->headers_out.refresh) {
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232 r->headers_out.refresh->hash = 0;
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233 }
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234
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235 r->main_filter_need_in_memory = 1;
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236 r->allow_ranges = 0;
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237
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238 return NGX_OK;
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239 }
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240
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241
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242 static ngx_int_t
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243 ngx_http_image_body_filter(ngx_http_request_t *r, ngx_chain_t *in)
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244 {
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245 ngx_int_t rc;
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246 ngx_str_t *ct;
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247 ngx_chain_t out;
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248 ngx_http_image_filter_ctx_t *ctx;
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249 ngx_http_image_filter_conf_t *conf;
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250
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251 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "image filter");
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252
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253 if (in == NULL) {
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254 return ngx_http_next_body_filter(r, in);
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255 }
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256
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257 ctx = ngx_http_get_module_ctx(r, ngx_http_image_filter_module);
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258
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259 if (ctx == NULL) {
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260 return ngx_http_next_body_filter(r, in);
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261 }
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262
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263 switch (ctx->phase) {
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264
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265 case NGX_HTTP_IMAGE_START:
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266
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267 ctx->type = ngx_http_image_test(r, in);
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268
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269 conf = ngx_http_get_module_loc_conf(r, ngx_http_image_filter_module);
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270
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271 if (ctx->type == NGX_HTTP_IMAGE_NONE) {
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272
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273 if (conf->filter == NGX_HTTP_IMAGE_SIZE) {
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274 out.buf = ngx_http_image_json(r, NULL);
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275
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276 if (out.buf) {
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277 out.next = NULL;
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488
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278 ctx->phase = NGX_HTTP_IMAGE_DONE;
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484
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279
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488
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280 return ngx_http_image_send(r, ctx, &out);
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484
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281 }
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282 }
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283
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284 return ngx_http_filter_finalize_request(r,
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488
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285 &ngx_http_image_filter_module,
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484
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286 NGX_HTTP_UNSUPPORTED_MEDIA_TYPE);
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287 }
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288
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289 /* override content type */
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290
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291 ct = &ngx_http_image_types[ctx->type - 1];
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292 r->headers_out.content_type_len = ct->len;
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293 r->headers_out.content_type = *ct;
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494
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294 r->headers_out.content_type_lowcase = NULL;
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484
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295
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296 if (conf->filter == NGX_HTTP_IMAGE_TEST) {
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488
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297 ctx->phase = NGX_HTTP_IMAGE_PASS;
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298
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299 return ngx_http_image_send(r, ctx, in);
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484
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300 }
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301
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302 ctx->phase = NGX_HTTP_IMAGE_READ;
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303
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304 /* fall through */
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305
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306 case NGX_HTTP_IMAGE_READ:
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307
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308 rc = ngx_http_image_read(r, in);
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309
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310 if (rc == NGX_AGAIN) {
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311 return NGX_OK;
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312 }
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313
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314 if (rc == NGX_ERROR) {
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315 return ngx_http_filter_finalize_request(r,
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488
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316 &ngx_http_image_filter_module,
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484
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317 NGX_HTTP_UNSUPPORTED_MEDIA_TYPE);
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318 }
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319
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320 /* fall through */
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321
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322 case NGX_HTTP_IMAGE_PROCESS:
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323
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324 out.buf = ngx_http_image_process(r);
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325
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326 if (out.buf == NULL) {
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327 return ngx_http_filter_finalize_request(r,
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488
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328 &ngx_http_image_filter_module,
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484
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329 NGX_HTTP_UNSUPPORTED_MEDIA_TYPE);
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330 }
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331
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332 out.next = NULL;
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488
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333 ctx->phase = NGX_HTTP_IMAGE_PASS;
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334
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335 return ngx_http_image_send(r, ctx, &out);
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484
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336
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488
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337 case NGX_HTTP_IMAGE_PASS:
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338
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339 return ngx_http_next_body_filter(r, in);
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484
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340
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341 default: /* NGX_HTTP_IMAGE_DONE */
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342
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488
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343 rc = ngx_http_next_body_filter(r, NULL);
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344
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345 /* NGX_ERROR resets any pending data */
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346 return (rc == NGX_OK) ? NGX_ERROR : rc;
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484
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347 }
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488
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348 }
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484
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349
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488
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350
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351 static ngx_int_t
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352 ngx_http_image_send(ngx_http_request_t *r, ngx_http_image_filter_ctx_t *ctx,
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353 ngx_chain_t *in)
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354 {
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355 ngx_int_t rc;
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484
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356
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357 rc = ngx_http_next_header_filter(r);
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358
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359 if (rc == NGX_ERROR || rc > NGX_OK || r->header_only) {
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488
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360 return NGX_ERROR;
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484
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361 }
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362
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488
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363 rc = ngx_http_next_body_filter(r, in);
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364
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365 if (ctx->phase == NGX_HTTP_IMAGE_DONE) {
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366 /* NGX_ERROR resets any pending data */
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367 return (rc == NGX_OK) ? NGX_ERROR : rc;
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368 }
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369
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370 return rc;
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484
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371 }
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372
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373
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374 static ngx_uint_t
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375 ngx_http_image_test(ngx_http_request_t *r, ngx_chain_t *in)
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376 {
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377 u_char *p;
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378
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379 p = in->buf->pos;
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380
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381 if (in->buf->last - p < 16) {
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382 return NGX_HTTP_IMAGE_NONE;
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383 }
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384
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385 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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386 "image filter: \"%c%c\"", p[0], p[1]);
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387
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388 if (p[0] == 0xff && p[1] == 0xd8) {
|
|
|
389
|
|
|
390 /* JPEG */
|
|
|
391
|
|
|
392 return NGX_HTTP_IMAGE_JPEG;
|
|
|
393
|
|
|
394 } else if (p[0] == 'G' && p[1] == 'I' && p[2] == 'F' && p[3] == '8'
|
|
498
|
395 && p[5] == 'a')
|
|
484
|
396 {
|
|
498
|
397 if (p[4] == '9' || p[4] == '7') {
|
|
|
398 /* GIF */
|
|
|
399 return NGX_HTTP_IMAGE_GIF;
|
|
|
400 }
|
|
484
|
401
|
|
|
402 } else if (p[0] == 0x89 && p[1] == 'P' && p[2] == 'N' && p[3] == 'G'
|
|
|
403 && p[4] == 0x0d && p[5] == 0x0a && p[6] == 0x1a && p[7] == 0x0a)
|
|
|
404 {
|
|
|
405 /* PNG */
|
|
|
406
|
|
|
407 return NGX_HTTP_IMAGE_PNG;
|
|
|
408 }
|
|
|
409
|
|
|
410 return NGX_HTTP_IMAGE_NONE;
|
|
|
411 }
|
|
|
412
|
|
|
413
|
|
|
414 static ngx_int_t
|
|
|
415 ngx_http_image_read(ngx_http_request_t *r, ngx_chain_t *in)
|
|
|
416 {
|
|
|
417 u_char *p;
|
|
|
418 size_t size, rest;
|
|
|
419 ngx_buf_t *b;
|
|
|
420 ngx_chain_t *cl;
|
|
|
421 ngx_http_image_filter_ctx_t *ctx;
|
|
|
422
|
|
|
423 ctx = ngx_http_get_module_ctx(r, ngx_http_image_filter_module);
|
|
|
424
|
|
|
425 if (ctx->image == NULL) {
|
|
|
426 ctx->image = ngx_palloc(r->pool, ctx->length);
|
|
|
427 if (ctx->image == NULL) {
|
|
|
428 return NGX_ERROR;
|
|
|
429 }
|
|
|
430
|
|
|
431 ctx->last = ctx->image;
|
|
|
432 }
|
|
|
433
|
|
|
434 p = ctx->last;
|
|
|
435
|
|
|
436 for (cl = in; cl; cl = cl->next) {
|
|
|
437
|
|
|
438 b = cl->buf;
|
|
|
439 size = b->last - b->pos;
|
|
|
440
|
|
|
441 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
|
|
|
442 "image buf: %uz", size);
|
|
|
443
|
|
|
444 rest = ctx->image + ctx->length - p;
|
|
|
445 size = (rest < size) ? rest : size;
|
|
|
446
|
|
|
447 p = ngx_cpymem(p, b->pos, size);
|
|
|
448 b->pos += size;
|
|
|
449
|
|
|
450 if (b->last_buf) {
|
|
|
451 ctx->last = p;
|
|
|
452 return NGX_OK;
|
|
|
453 }
|
|
|
454 }
|
|
|
455
|
|
|
456 ctx->last = p;
|
|
|
457 r->connection->buffered |= NGX_HTTP_IMAGE_BUFFERED;
|
|
|
458
|
|
|
459 return NGX_AGAIN;
|
|
|
460 }
|
|
|
461
|
|
|
462
|
|
|
463 static ngx_buf_t *
|
|
|
464 ngx_http_image_process(ngx_http_request_t *r)
|
|
|
465 {
|
|
|
466 ngx_int_t rc;
|
|
|
467 ngx_http_image_filter_ctx_t *ctx;
|
|
|
468 ngx_http_image_filter_conf_t *conf;
|
|
|
469
|
|
|
470 r->connection->buffered &= ~NGX_HTTP_IMAGE_BUFFERED;
|
|
|
471
|
|
|
472 ctx = ngx_http_get_module_ctx(r, ngx_http_image_filter_module);
|
|
|
473
|
|
|
474 rc = ngx_http_image_size(r, ctx);
|
|
|
475
|
|
|
476 conf = ngx_http_get_module_loc_conf(r, ngx_http_image_filter_module);
|
|
|
477
|
|
|
478 if (conf->filter == NGX_HTTP_IMAGE_SIZE) {
|
|
510
|
479 return ngx_http_image_json(r, rc == NGX_OK ? ctx : NULL);
|
|
|
480 }
|
|
484
|
481
|
|
510
|
482 ctx->max_width = ngx_http_image_filter_get_value(r, conf->wcv, conf->width);
|
|
|
483 if (ctx->max_width == 0) {
|
|
|
484 return NULL;
|
|
484
|
485 }
|
|
|
486
|
|
510
|
487 ctx->max_height = ngx_http_image_filter_get_value(r, conf->hcv,
|
|
|
488 conf->height);
|
|
|
489 if (ctx->max_height == 0) {
|
|
|
490 return NULL;
|
|
|
491 }
|
|
|
492
|
|
|
493 if (rc == NGX_OK
|
|
|
494 && ctx->width <= ctx->max_width
|
|
|
495 && ctx->height <= ctx->max_height)
|
|
|
496 {
|
|
|
497 return ngx_http_image_asis(r, ctx);
|
|
|
498 }
|
|
|
499
|
|
|
500 return ngx_http_image_resize(r, ctx);
|
|
484
|
501 }
|
|
|
502
|
|
|
503
|
|
|
504 static ngx_buf_t *
|
|
|
505 ngx_http_image_json(ngx_http_request_t *r, ngx_http_image_filter_ctx_t *ctx)
|
|
|
506 {
|
|
|
507 size_t len;
|
|
|
508 ngx_buf_t *b;
|
|
|
509
|
|
|
510 b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t));
|
|
|
511 if (b == NULL) {
|
|
|
512 return NULL;
|
|
|
513 }
|
|
|
514
|
|
|
515 b->memory = 1;
|
|
|
516 b->last_buf = 1;
|
|
|
517
|
|
|
518 ngx_http_clean_header(r);
|
|
|
519
|
|
|
520 r->headers_out.status = NGX_HTTP_OK;
|
|
|
521 r->headers_out.content_type.len = sizeof("text/plain") - 1;
|
|
|
522 r->headers_out.content_type.data = (u_char *) "text/plain";
|
|
494
|
523 r->headers_out.content_type_lowcase = NULL;
|
|
484
|
524
|
|
|
525 if (ctx == NULL) {
|
|
|
526 b->pos = (u_char *) "{}" CRLF;
|
|
|
527 b->last = b->pos + sizeof("{}" CRLF) - 1;
|
|
|
528
|
|
|
529 ngx_http_image_length(r, b);
|
|
|
530
|
|
|
531 return b;
|
|
|
532 }
|
|
|
533
|
|
|
534 len = sizeof("{ \"img\" : "
|
|
|
535 "{ \"width\": , \"height\": , \"type\": \"jpeg\" } }" CRLF) - 1
|
|
|
536 + 2 * NGX_SIZE_T_LEN;
|
|
|
537
|
|
|
538 b->pos = ngx_pnalloc(r->pool, len);
|
|
|
539 if (b->pos == NULL) {
|
|
|
540 return NULL;
|
|
|
541 }
|
|
|
542
|
|
|
543 b->last = ngx_sprintf(b->pos,
|
|
|
544 "{ \"img\" : "
|
|
|
545 "{ \"width\": %uz,"
|
|
|
546 " \"height\": %uz,"
|
|
|
547 " \"type\": \"%s\" } }" CRLF,
|
|
|
548 ctx->width, ctx->height,
|
|
|
549 ngx_http_image_types[ctx->type - 1].data + 6);
|
|
|
550
|
|
|
551 ngx_http_image_length(r, b);
|
|
|
552
|
|
|
553 return b;
|
|
|
554 }
|
|
|
555
|
|
|
556
|
|
|
557 static ngx_buf_t *
|
|
|
558 ngx_http_image_asis(ngx_http_request_t *r, ngx_http_image_filter_ctx_t *ctx)
|
|
|
559 {
|
|
|
560 ngx_buf_t *b;
|
|
|
561
|
|
|
562 b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t));
|
|
|
563 if (b == NULL) {
|
|
|
564 return NULL;
|
|
|
565 }
|
|
|
566
|
|
|
567 b->pos = ctx->image;
|
|
|
568 b->last = ctx->last;
|
|
|
569 b->memory = 1;
|
|
|
570 b->last_buf = 1;
|
|
|
571
|
|
|
572 ngx_http_image_length(r, b);
|
|
|
573
|
|
|
574 return b;
|
|
|
575 }
|
|
|
576
|
|
|
577
|
|
|
578 static void
|
|
|
579 ngx_http_image_length(ngx_http_request_t *r, ngx_buf_t *b)
|
|
|
580 {
|
|
|
581 r->headers_out.content_length_n = b->last - b->pos;
|
|
|
582
|
|
|
583 if (r->headers_out.content_length) {
|
|
|
584 r->headers_out.content_length->hash = 0;
|
|
|
585 }
|
|
|
586
|
|
|
587 r->headers_out.content_length = NULL;
|
|
|
588 }
|
|
|
589
|
|
|
590
|
|
|
591 static ngx_int_t
|
|
|
592 ngx_http_image_size(ngx_http_request_t *r, ngx_http_image_filter_ctx_t *ctx)
|
|
|
593 {
|
|
|
594 u_char *p, *last;
|
|
|
595 ngx_uint_t width, height;
|
|
|
596
|
|
|
597 p = ctx->image;
|
|
|
598
|
|
|
599 switch (ctx->type) {
|
|
|
600
|
|
|
601 case NGX_HTTP_IMAGE_JPEG:
|
|
|
602
|
|
|
603 p += 2;
|
|
|
604 last = ctx->image + ctx->length - 10;
|
|
|
605
|
|
|
606 while (p < last) {
|
|
|
607
|
|
|
608 if (p[0] == 0xff && p[1] != 0xff) {
|
|
|
609
|
|
|
610 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
|
|
|
611 "JPEG: %02xd %02xd", *p, *(p + 1));
|
|
|
612
|
|
|
613 p++;
|
|
|
614
|
|
|
615 if (*p == 0xc0 || *p == 0xc1 || *p == 0xc2 || *p == 0xc3
|
|
|
616 || *p == 0xc9 || *p == 0xca || *p == 0xcb)
|
|
|
617 {
|
|
|
618 goto found;
|
|
|
619 }
|
|
|
620
|
|
|
621 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
|
|
|
622 "JPEG: %02xd %02xd", p[1], p[2]);
|
|
|
623
|
|
|
624 p += p[1] * 256 + p[2];
|
|
|
625
|
|
|
626 continue;
|
|
|
627 }
|
|
|
628
|
|
|
629 p++;
|
|
|
630 }
|
|
|
631
|
|
|
632 return NGX_DECLINED;
|
|
|
633
|
|
|
634 found:
|
|
|
635
|
|
|
636 width = p[6] * 256 + p[7];
|
|
|
637 height = p[4] * 256 + p[5];
|
|
|
638
|
|
|
639 break;
|
|
|
640
|
|
|
641 case NGX_HTTP_IMAGE_GIF:
|
|
|
642
|
|
|
643 if (ctx->length < 10) {
|
|
|
644 return NGX_DECLINED;
|
|
|
645 }
|
|
|
646
|
|
|
647 width = p[7] * 256 + p[6];
|
|
|
648 height = p[9] * 256 + p[8];
|
|
|
649
|
|
|
650 break;
|
|
|
651
|
|
|
652 case NGX_HTTP_IMAGE_PNG:
|
|
|
653
|
|
|
654 if (ctx->length < 24) {
|
|
|
655 return NGX_DECLINED;
|
|
|
656 }
|
|
|
657
|
|
|
658 width = p[18] * 256 + p[19];
|
|
|
659 height = p[22] * 256 + p[23];
|
|
|
660
|
|
|
661 break;
|
|
|
662
|
|
|
663 default:
|
|
|
664
|
|
|
665 return NGX_DECLINED;
|
|
|
666 }
|
|
|
667
|
|
|
668 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
|
|
|
669 "image size: %d x %d", width, height);
|
|
|
670
|
|
|
671 ctx->width = width;
|
|
|
672 ctx->height = height;
|
|
|
673
|
|
|
674 return NGX_OK;
|
|
|
675 }
|
|
|
676
|
|
|
677
|
|
|
678 static ngx_buf_t *
|
|
|
679 ngx_http_image_resize(ngx_http_request_t *r, ngx_http_image_filter_ctx_t *ctx)
|
|
|
680 {
|
|
|
681 int sx, sy, dx, dy, ox, oy,
|
|
526
|
682 colors, transparent, red, green, blue, size;
|
|
484
|
683 u_char *out;
|
|
|
684 ngx_buf_t *b;
|
|
|
685 ngx_uint_t resize;
|
|
|
686 gdImagePtr src, dst;
|
|
|
687 ngx_pool_cleanup_t *cln;
|
|
|
688 ngx_http_image_filter_conf_t *conf;
|
|
|
689
|
|
|
690 src = ngx_http_image_source(r, ctx);
|
|
|
691
|
|
|
692 if (src == NULL) {
|
|
|
693 return NULL;
|
|
|
694 }
|
|
|
695
|
|
|
696 sx = gdImageSX(src);
|
|
|
697 sy = gdImageSY(src);
|
|
|
698
|
|
|
699 conf = ngx_http_get_module_loc_conf(r, ngx_http_image_filter_module);
|
|
|
700
|
|
510
|
701 if ((ngx_uint_t) sx <= ctx->max_width
|
|
|
702 && (ngx_uint_t) sy <= ctx->max_height)
|
|
|
703 {
|
|
484
|
704 gdImageDestroy(src);
|
|
|
705 return ngx_http_image_asis(r, ctx);
|
|
|
706 }
|
|
|
707
|
|
|
708 colors = gdImageColorsTotal(src);
|
|
|
709 transparent = gdImageGetTransparent(src);
|
|
|
710
|
|
526
|
711 if (transparent != -1 && colors) {
|
|
|
712 red = gdImageRed(src, transparent);
|
|
|
713 green = gdImageGreen(src, transparent);
|
|
|
714 blue = gdImageBlue(src, transparent);
|
|
|
715 gdImageColorTransparent(src, -1);
|
|
|
716
|
|
|
717 } else {
|
|
|
718 red = 0; green = 0; blue = 0;
|
|
|
719 }
|
|
|
720
|
|
484
|
721 dx = sx;
|
|
|
722 dy = sy;
|
|
|
723
|
|
|
724 if (conf->filter == NGX_HTTP_IMAGE_RESIZE) {
|
|
|
725
|
|
510
|
726 if ((ngx_uint_t) dx > ctx->max_width) {
|
|
|
727 dy = dy * ctx->max_width / dx;
|
|
484
|
728 dy = dy ? dy : 1;
|
|
510
|
729 dx = ctx->max_width;
|
|
484
|
730 }
|
|
|
731
|
|
510
|
732 if ((ngx_uint_t) dy > ctx->max_height) {
|
|
|
733 dx = dx * ctx->max_height / dy;
|
|
484
|
734 dx = dx ? dx : 1;
|
|
510
|
735 dy = ctx->max_height;
|
|
484
|
736 }
|
|
|
737
|
|
|
738 resize = 1;
|
|
|
739
|
|
|
740 } else { /* NGX_HTTP_IMAGE_CROP */
|
|
|
741
|
|
|
742 resize = 0;
|
|
|
743
|
|
510
|
744 if ((ngx_uint_t) (dx * 100 / dy)
|
|
|
745 < ctx->max_width * 100 / ctx->max_height)
|
|
|
746 {
|
|
|
747 if ((ngx_uint_t) dx > ctx->max_width) {
|
|
|
748 dy = dy * ctx->max_width / dx;
|
|
484
|
749 dy = dy ? dy : 1;
|
|
510
|
750 dx = ctx->max_width;
|
|
484
|
751 resize = 1;
|
|
|
752 }
|
|
|
753
|
|
|
754 } else {
|
|
510
|
755 if ((ngx_uint_t) dy > ctx->max_height) {
|
|
|
756 dx = dx * ctx->max_height / dy;
|
|
484
|
757 dx = dx ? dx : 1;
|
|
510
|
758 dy = ctx->max_height;
|
|
484
|
759 resize = 1;
|
|
|
760 }
|
|
|
761 }
|
|
|
762 }
|
|
|
763
|
|
|
764 if (resize) {
|
|
|
765 dst = ngx_http_image_new(r, dx, dy, colors);
|
|
|
766 if (dst == NULL) {
|
|
|
767 gdImageDestroy(src);
|
|
|
768 return NULL;
|
|
|
769 }
|
|
|
770
|
|
|
771 gdImageCopyResampled(dst, src, 0, 0, 0, 0, dx, dy, sx, sy);
|
|
|
772
|
|
|
773 gdImageDestroy(src);
|
|
|
774
|
|
|
775 } else {
|
|
|
776 dst = src;
|
|
|
777 }
|
|
|
778
|
|
|
779 if (conf->filter == NGX_HTTP_IMAGE_CROP) {
|
|
|
780
|
|
|
781 src = dst;
|
|
|
782
|
|
510
|
783 if ((ngx_uint_t) dx > ctx->max_width) {
|
|
|
784 ox = dx - ctx->max_width;
|
|
484
|
785
|
|
|
786 } else {
|
|
|
787 ox = 0;
|
|
|
788 }
|
|
|
789
|
|
510
|
790 if ((ngx_uint_t) dy > ctx->max_height) {
|
|
|
791 oy = dy - ctx->max_height;
|
|
484
|
792
|
|
|
793 } else {
|
|
|
794 oy = 0;
|
|
|
795 }
|
|
|
796
|
|
|
797 if (ox || oy) {
|
|
|
798
|
|
|
799 dst = ngx_http_image_new(r, dx - ox, dy - oy, colors);
|
|
|
800
|
|
|
801 if (dst == NULL) {
|
|
|
802 gdImageDestroy(src);
|
|
|
803 return NULL;
|
|
|
804 }
|
|
|
805
|
|
|
806 ox /= 2;
|
|
|
807 oy /= 2;
|
|
|
808
|
|
|
809 ngx_log_debug4(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
|
|
|
810 "image crop: %d x %d @ %d x %d",
|
|
|
811 dx, dy, ox, oy);
|
|
|
812
|
|
|
813 gdImageCopy(dst, src, 0, 0, ox, oy, dx - ox, dy - oy);
|
|
|
814
|
|
|
815 gdImageDestroy(src);
|
|
|
816 }
|
|
|
817 }
|
|
|
818
|
|
526
|
819 if (transparent != -1 && colors) {
|
|
|
820 gdImageColorTransparent(dst, gdImageColorExact(dst, red, green, blue));
|
|
|
821 }
|
|
484
|
822
|
|
|
823 out = ngx_http_image_out(r, ctx->type, dst, &size);
|
|
|
824
|
|
|
825 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
|
|
|
826 "image: %d x %d %d", sx, sy, colors);
|
|
|
827
|
|
|
828 gdImageDestroy(dst);
|
|
|
829 ngx_pfree(r->pool, ctx->image);
|
|
|
830
|
|
|
831 if (out == NULL) {
|
|
|
832 return NULL;
|
|
|
833 }
|
|
|
834
|
|
|
835 cln = ngx_pool_cleanup_add(r->pool, 0);
|
|
|
836 if (cln == NULL) {
|
|
|
837 gdFree(out);
|
|
|
838 return NULL;
|
|
|
839 }
|
|
|
840
|
|
|
841 b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t));
|
|
|
842 if (b == NULL) {
|
|
|
843 gdFree(out);
|
|
|
844 return NULL;
|
|
|
845 }
|
|
|
846
|
|
|
847 cln->handler = ngx_http_image_cleanup;
|
|
|
848 cln->data = out;
|
|
|
849
|
|
|
850 b->pos = out;
|
|
|
851 b->last = out + size;
|
|
|
852 b->memory = 1;
|
|
|
853 b->last_buf = 1;
|
|
|
854
|
|
|
855 ngx_http_image_length(r, b);
|
|
|
856
|
|
|
857 return b;
|
|
|
858 }
|
|
|
859
|
|
|
860
|
|
|
861 static gdImagePtr
|
|
|
862 ngx_http_image_source(ngx_http_request_t *r, ngx_http_image_filter_ctx_t *ctx)
|
|
|
863 {
|
|
|
864 char *failed;
|
|
|
865 gdImagePtr img;
|
|
|
866
|
|
|
867 img = NULL;
|
|
|
868
|
|
|
869 switch (ctx->type) {
|
|
|
870
|
|
|
871 case NGX_HTTP_IMAGE_JPEG:
|
|
|
872 img = gdImageCreateFromJpegPtr(ctx->length, ctx->image);
|
|
|
873 failed = "gdImageCreateFromJpegPtr() failed";
|
|
|
874 break;
|
|
|
875
|
|
|
876 case NGX_HTTP_IMAGE_GIF:
|
|
|
877 img = gdImageCreateFromGifPtr(ctx->length, ctx->image);
|
|
|
878 failed = "gdImageCreateFromGifPtr() failed";
|
|
|
879 break;
|
|
|
880
|
|
|
881 case NGX_HTTP_IMAGE_PNG:
|
|
|
882 img = gdImageCreateFromPngPtr(ctx->length, ctx->image);
|
|
|
883 failed = "gdImageCreateFromPngPtr() failed";
|
|
|
884 break;
|
|
|
885
|
|
|
886 default:
|
|
|
887 failed = "unknown image type";
|
|
|
888 break;
|
|
|
889 }
|
|
|
890
|
|
|
891 if (img == NULL) {
|
|
|
892 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, failed);
|
|
|
893 }
|
|
|
894
|
|
|
895 return img;
|
|
|
896 }
|
|
|
897
|
|
|
898
|
|
|
899 static gdImagePtr
|
|
|
900 ngx_http_image_new(ngx_http_request_t *r, int w, int h, int colors)
|
|
|
901 {
|
|
|
902 gdImagePtr img;
|
|
|
903
|
|
|
904 if (colors == 0) {
|
|
|
905 img = gdImageCreateTrueColor(w, h);
|
|
|
906
|
|
|
907 if (img == NULL) {
|
|
|
908 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
|
|
|
909 "gdImageCreateTrueColor() failed");
|
|
|
910 return NULL;
|
|
|
911 }
|
|
|
912
|
|
|
913 } else {
|
|
|
914 img = gdImageCreate(w, h);
|
|
|
915
|
|
|
916 if (img == NULL) {
|
|
|
917 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
|
|
|
918 "gdImageCreate() failed");
|
|
|
919 return NULL;
|
|
|
920 }
|
|
|
921 }
|
|
|
922
|
|
|
923 return img;
|
|
|
924 }
|
|
|
925
|
|
|
926
|
|
|
927 static u_char *
|
|
|
928 ngx_http_image_out(ngx_http_request_t *r, ngx_uint_t type, gdImagePtr img,
|
|
|
929 int *size)
|
|
|
930 {
|
|
492
|
931 char *failed;
|
|
|
932 u_char *out;
|
|
|
933 ngx_http_image_filter_conf_t *conf;
|
|
484
|
934
|
|
|
935 out = NULL;
|
|
|
936
|
|
|
937 switch (type) {
|
|
|
938
|
|
|
939 case NGX_HTTP_IMAGE_JPEG:
|
|
492
|
940 conf = ngx_http_get_module_loc_conf(r, ngx_http_image_filter_module);
|
|
|
941 out = gdImageJpegPtr(img, size, conf->jpeg_quality);
|
|
484
|
942 failed = "gdImageJpegPtr() failed";
|
|
|
943 break;
|
|
|
944
|
|
|
945 case NGX_HTTP_IMAGE_GIF:
|
|
|
946 out = gdImageGifPtr(img, size);
|
|
|
947 failed = "gdImageGifPtr() failed";
|
|
|
948 break;
|
|
|
949
|
|
|
950 case NGX_HTTP_IMAGE_PNG:
|
|
|
951 out = gdImagePngPtr(img, size);
|
|
|
952 failed = "gdImagePngPtr() failed";
|
|
|
953 break;
|
|
|
954
|
|
|
955 default:
|
|
|
956 failed = "unknown image type";
|
|
|
957 break;
|
|
|
958 }
|
|
|
959
|
|
|
960 if (out == NULL) {
|
|
|
961 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, failed);
|
|
|
962 }
|
|
|
963
|
|
|
964 return out;
|
|
|
965 }
|
|
|
966
|
|
|
967
|
|
|
968 static void
|
|
|
969 ngx_http_image_cleanup(void *data)
|
|
|
970 {
|
|
|
971 gdFree(data);
|
|
|
972 }
|
|
|
973
|
|
|
974
|
|
510
|
975 static ngx_uint_t
|
|
|
976 ngx_http_image_filter_get_value(ngx_http_request_t *r,
|
|
|
977 ngx_http_complex_value_t *cv, ngx_uint_t v)
|
|
|
978 {
|
|
|
979 ngx_str_t val;
|
|
|
980
|
|
|
981 if (cv == NULL) {
|
|
|
982 return v;
|
|
|
983 }
|
|
|
984
|
|
|
985 if (ngx_http_complex_value(r, cv, &val) != NGX_OK) {
|
|
|
986 return 0;
|
|
|
987 }
|
|
|
988
|
|
|
989 return ngx_http_image_filter_value(&val);
|
|
|
990 }
|
|
|
991
|
|
|
992
|
|
|
993 static ngx_uint_t
|
|
|
994 ngx_http_image_filter_value(ngx_str_t *value)
|
|
|
995 {
|
|
|
996 ngx_int_t n;
|
|
|
997
|
|
|
998 if (value->len == 1 && value->data[0] == '-') {
|
|
|
999 return (ngx_uint_t) -1;
|
|
|
1000 }
|
|
|
1001
|
|
|
1002 n = ngx_atoi(value->data, value->len);
|
|
|
1003
|
|
|
1004 if (n > 0) {
|
|
|
1005 return (ngx_uint_t) n;
|
|
|
1006 }
|
|
|
1007
|
|
|
1008 return 0;
|
|
|
1009 }
|
|
|
1010
|
|
|
1011
|
|
484
|
1012 static void *
|
|
|
1013 ngx_http_image_filter_create_conf(ngx_conf_t *cf)
|
|
|
1014 {
|
|
|
1015 ngx_http_image_filter_conf_t *conf;
|
|
|
1016
|
|
|
1017 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_image_filter_conf_t));
|
|
|
1018 if (conf == NULL) {
|
|
496
|
1019 return NULL;
|
|
484
|
1020 }
|
|
|
1021
|
|
|
1022 conf->filter = NGX_CONF_UNSET_UINT;
|
|
492
|
1023 conf->jpeg_quality = NGX_CONF_UNSET;
|
|
484
|
1024 conf->buffer_size = NGX_CONF_UNSET_SIZE;
|
|
|
1025
|
|
|
1026 return conf;
|
|
|
1027 }
|
|
|
1028
|
|
|
1029
|
|
|
1030 static char *
|
|
|
1031 ngx_http_image_filter_merge_conf(ngx_conf_t *cf, void *parent, void *child)
|
|
|
1032 {
|
|
|
1033 ngx_http_image_filter_conf_t *prev = parent;
|
|
|
1034 ngx_http_image_filter_conf_t *conf = child;
|
|
|
1035
|
|
|
1036 if (conf->filter == NGX_CONF_UNSET_UINT) {
|
|
|
1037
|
|
|
1038 if (prev->filter == NGX_CONF_UNSET_UINT) {
|
|
|
1039 conf->filter = NGX_HTTP_IMAGE_OFF;
|
|
|
1040
|
|
|
1041 } else {
|
|
|
1042 conf->filter = prev->filter;
|
|
|
1043 conf->width = prev->width;
|
|
|
1044 conf->height = prev->height;
|
|
510
|
1045 conf->wcv = prev->wcv;
|
|
|
1046 conf->hcv = prev->hcv;
|
|
484
|
1047 }
|
|
|
1048 }
|
|
|
1049
|
|
492
|
1050 /* 75 is libjpeg default quality */
|
|
|
1051 ngx_conf_merge_value(conf->jpeg_quality, prev->jpeg_quality, 75);
|
|
|
1052
|
|
484
|
1053 ngx_conf_merge_size_value(conf->buffer_size, prev->buffer_size,
|
|
|
1054 1 * 1024 * 1024);
|
|
|
1055
|
|
|
1056 return NGX_CONF_OK;
|
|
|
1057 }
|
|
|
1058
|
|
|
1059
|
|
|
1060 static char *
|
|
|
1061 ngx_http_image_filter(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
|
|
|
1062 {
|
|
|
1063 ngx_http_image_filter_conf_t *imcf = conf;
|
|
|
1064
|
|
510
|
1065 ngx_str_t *value;
|
|
|
1066 ngx_int_t n;
|
|
|
1067 ngx_uint_t i;
|
|
|
1068 ngx_http_complex_value_t cv;
|
|
|
1069 ngx_http_compile_complex_value_t ccv;
|
|
484
|
1070
|
|
|
1071 value = cf->args->elts;
|
|
|
1072
|
|
|
1073 i = 1;
|
|
|
1074
|
|
|
1075 if (cf->args->nelts == 2) {
|
|
|
1076 if (ngx_strcmp(value[i].data, "off") == 0) {
|
|
|
1077 imcf->filter = NGX_HTTP_IMAGE_OFF;
|
|
|
1078
|
|
|
1079 } else if (ngx_strcmp(value[i].data, "test") == 0) {
|
|
|
1080 imcf->filter = NGX_HTTP_IMAGE_TEST;
|
|
|
1081
|
|
|
1082 } else if (ngx_strcmp(value[i].data, "size") == 0) {
|
|
|
1083 imcf->filter = NGX_HTTP_IMAGE_SIZE;
|
|
|
1084
|
|
|
1085 } else {
|
|
|
1086 goto failed;
|
|
|
1087 }
|
|
|
1088
|
|
|
1089 return NGX_CONF_OK;
|
|
|
1090 }
|
|
|
1091
|
|
|
1092 if (ngx_strcmp(value[i].data, "resize") == 0) {
|
|
|
1093 imcf->filter = NGX_HTTP_IMAGE_RESIZE;
|
|
|
1094
|
|
|
1095 } else if (ngx_strcmp(value[i].data, "crop") == 0) {
|
|
|
1096 imcf->filter = NGX_HTTP_IMAGE_CROP;
|
|
|
1097
|
|
|
1098 } else {
|
|
|
1099 goto failed;
|
|
|
1100 }
|
|
|
1101
|
|
510
|
1102 ngx_memzero(&ccv, sizeof(ngx_http_compile_complex_value_t));
|
|
|
1103
|
|
|
1104 ccv.cf = cf;
|
|
|
1105 ccv.value = &value[++i];
|
|
|
1106 ccv.complex_value = &cv;
|
|
484
|
1107
|
|
510
|
1108 if (ngx_http_compile_complex_value(&ccv) != NGX_OK) {
|
|
|
1109 return NGX_CONF_ERROR;
|
|
|
1110 }
|
|
484
|
1111
|
|
510
|
1112 if (cv.lengths == NULL) {
|
|
|
1113 n = ngx_http_image_filter_value(&value[i]);
|
|
|
1114
|
|
|
1115 if (n == 0) {
|
|
484
|
1116 goto failed;
|
|
|
1117 }
|
|
|
1118
|
|
|
1119 imcf->width = (ngx_uint_t) n;
|
|
510
|
1120
|
|
|
1121 } else {
|
|
|
1122 imcf->wcv = ngx_palloc(cf->pool, sizeof(ngx_http_complex_value_t));
|
|
|
1123 if (imcf->wcv == NULL) {
|
|
|
1124 return NGX_CONF_ERROR;
|
|
|
1125 }
|
|
|
1126
|
|
|
1127 *imcf->wcv = cv;
|
|
484
|
1128 }
|
|
|
1129
|
|
510
|
1130 ngx_memzero(&ccv, sizeof(ngx_http_compile_complex_value_t));
|
|
|
1131
|
|
|
1132 ccv.cf = cf;
|
|
|
1133 ccv.value = &value[++i];
|
|
|
1134 ccv.complex_value = &cv;
|
|
484
|
1135
|
|
510
|
1136 if (ngx_http_compile_complex_value(&ccv) != NGX_OK) {
|
|
|
1137 return NGX_CONF_ERROR;
|
|
|
1138 }
|
|
484
|
1139
|
|
510
|
1140 if (cv.lengths == NULL) {
|
|
|
1141 n = ngx_http_image_filter_value(&value[i]);
|
|
|
1142
|
|
|
1143 if (n == 0) {
|
|
484
|
1144 goto failed;
|
|
|
1145 }
|
|
|
1146
|
|
|
1147 imcf->height = (ngx_uint_t) n;
|
|
510
|
1148
|
|
|
1149 } else {
|
|
|
1150 imcf->hcv = ngx_palloc(cf->pool, sizeof(ngx_http_complex_value_t));
|
|
|
1151 if (imcf->hcv == NULL) {
|
|
|
1152 return NGX_CONF_ERROR;
|
|
|
1153 }
|
|
|
1154
|
|
|
1155 *imcf->hcv = cv;
|
|
484
|
1156 }
|
|
|
1157
|
|
|
1158 return NGX_CONF_OK;
|
|
|
1159
|
|
|
1160 failed:
|
|
|
1161
|
|
|
1162 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid parameter \"%V\"",
|
|
|
1163 &value[i]);
|
|
|
1164
|
|
|
1165 return NGX_CONF_ERROR;
|
|
|
1166 }
|
|
|
1167
|
|
|
1168
|
|
|
1169 static ngx_int_t
|
|
|
1170 ngx_http_image_filter_init(ngx_conf_t *cf)
|
|
|
1171 {
|
|
|
1172 ngx_http_next_header_filter = ngx_http_top_header_filter;
|
|
|
1173 ngx_http_top_header_filter = ngx_http_image_header_filter;
|
|
|
1174
|
|
|
1175 ngx_http_next_body_filter = ngx_http_top_body_filter;
|
|
|
1176 ngx_http_top_body_filter = ngx_http_image_body_filter;
|
|
|
1177
|
|
|
1178 return NGX_OK;
|
|
|
1179 }
|
