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