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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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285
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286 if (conf->filter == NGX_HTTP_IMAGE_TEST) {
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488
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287 ctx->phase = NGX_HTTP_IMAGE_PASS;
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288
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289 return ngx_http_image_send(r, ctx, in);
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484
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290 }
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291
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292 ctx->phase = NGX_HTTP_IMAGE_READ;
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293
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294 /* fall through */
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295
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296 case NGX_HTTP_IMAGE_READ:
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297
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298 rc = ngx_http_image_read(r, in);
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299
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300 if (rc == NGX_AGAIN) {
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301 return NGX_OK;
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302 }
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303
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304 if (rc == NGX_ERROR) {
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305 return ngx_http_filter_finalize_request(r,
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488
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306 &ngx_http_image_filter_module,
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484
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307 NGX_HTTP_UNSUPPORTED_MEDIA_TYPE);
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308 }
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309
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310 /* fall through */
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311
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312 case NGX_HTTP_IMAGE_PROCESS:
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313
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314 out.buf = ngx_http_image_process(r);
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315
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316 if (out.buf == NULL) {
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317 return ngx_http_filter_finalize_request(r,
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488
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318 &ngx_http_image_filter_module,
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484
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319 NGX_HTTP_UNSUPPORTED_MEDIA_TYPE);
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320 }
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321
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322 out.next = NULL;
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488
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323 ctx->phase = NGX_HTTP_IMAGE_PASS;
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324
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325 return ngx_http_image_send(r, ctx, &out);
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484
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326
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488
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327 case NGX_HTTP_IMAGE_PASS:
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328
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329 return ngx_http_next_body_filter(r, in);
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484
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330
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331 default: /* NGX_HTTP_IMAGE_DONE */
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332
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488
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333 rc = ngx_http_next_body_filter(r, NULL);
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334
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335 /* NGX_ERROR resets any pending data */
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336 return (rc == NGX_OK) ? NGX_ERROR : rc;
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484
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337 }
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488
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338 }
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484
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339
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488
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340
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341 static ngx_int_t
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342 ngx_http_image_send(ngx_http_request_t *r, ngx_http_image_filter_ctx_t *ctx,
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343 ngx_chain_t *in)
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344 {
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345 ngx_int_t rc;
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484
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346
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347 rc = ngx_http_next_header_filter(r);
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348
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349 if (rc == NGX_ERROR || rc > NGX_OK || r->header_only) {
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488
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350 return NGX_ERROR;
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484
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351 }
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352
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488
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353 rc = ngx_http_next_body_filter(r, in);
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354
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355 if (ctx->phase == NGX_HTTP_IMAGE_DONE) {
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356 /* NGX_ERROR resets any pending data */
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357 return (rc == NGX_OK) ? NGX_ERROR : rc;
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358 }
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359
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360 return rc;
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484
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361 }
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362
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363
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364 static ngx_uint_t
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365 ngx_http_image_test(ngx_http_request_t *r, ngx_chain_t *in)
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366 {
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367 u_char *p;
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368
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369 p = in->buf->pos;
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370
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371 if (in->buf->last - p < 16) {
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372 return NGX_HTTP_IMAGE_NONE;
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373 }
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374
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375 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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376 "image filter: \"%c%c\"", p[0], p[1]);
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377
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378 if (p[0] == 0xff && p[1] == 0xd8) {
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379
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380 /* JPEG */
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381
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382 return NGX_HTTP_IMAGE_JPEG;
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383
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384 } else if (p[0] == 'G' && p[1] == 'I' && p[2] == 'F' && p[3] == '8'
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385 && p[4] == '9' && p[5] == 'a')
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386 {
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387 /* GIF */
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388
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389 return NGX_HTTP_IMAGE_GIF;
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390
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391 } else if (p[0] == 0x89 && p[1] == 'P' && p[2] == 'N' && p[3] == 'G'
|
|
|
392 && p[4] == 0x0d && p[5] == 0x0a && p[6] == 0x1a && p[7] == 0x0a)
|
|
|
393 {
|
|
|
394 /* PNG */
|
|
|
395
|
|
|
396 return NGX_HTTP_IMAGE_PNG;
|
|
|
397 }
|
|
|
398
|
|
|
399 return NGX_HTTP_IMAGE_NONE;
|
|
|
400 }
|
|
|
401
|
|
|
402
|
|
|
403 static ngx_int_t
|
|
|
404 ngx_http_image_read(ngx_http_request_t *r, ngx_chain_t *in)
|
|
|
405 {
|
|
|
406 u_char *p;
|
|
|
407 size_t size, rest;
|
|
|
408 ngx_buf_t *b;
|
|
|
409 ngx_chain_t *cl;
|
|
|
410 ngx_http_image_filter_ctx_t *ctx;
|
|
|
411
|
|
|
412 ctx = ngx_http_get_module_ctx(r, ngx_http_image_filter_module);
|
|
|
413
|
|
|
414 if (ctx->image == NULL) {
|
|
|
415 ctx->image = ngx_palloc(r->pool, ctx->length);
|
|
|
416 if (ctx->image == NULL) {
|
|
|
417 return NGX_ERROR;
|
|
|
418 }
|
|
|
419
|
|
|
420 ctx->last = ctx->image;
|
|
|
421 }
|
|
|
422
|
|
|
423 p = ctx->last;
|
|
|
424
|
|
|
425 for (cl = in; cl; cl = cl->next) {
|
|
|
426
|
|
|
427 b = cl->buf;
|
|
|
428 size = b->last - b->pos;
|
|
|
429
|
|
|
430 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
|
|
|
431 "image buf: %uz", size);
|
|
|
432
|
|
|
433 rest = ctx->image + ctx->length - p;
|
|
|
434 size = (rest < size) ? rest : size;
|
|
|
435
|
|
|
436 p = ngx_cpymem(p, b->pos, size);
|
|
|
437 b->pos += size;
|
|
|
438
|
|
|
439 if (b->last_buf) {
|
|
|
440 ctx->last = p;
|
|
|
441 return NGX_OK;
|
|
|
442 }
|
|
|
443 }
|
|
|
444
|
|
|
445 ctx->last = p;
|
|
|
446 r->connection->buffered |= NGX_HTTP_IMAGE_BUFFERED;
|
|
|
447
|
|
|
448 return NGX_AGAIN;
|
|
|
449 }
|
|
|
450
|
|
|
451
|
|
|
452 static ngx_buf_t *
|
|
|
453 ngx_http_image_process(ngx_http_request_t *r)
|
|
|
454 {
|
|
|
455 ngx_buf_t *b;
|
|
|
456 ngx_int_t rc;
|
|
|
457 ngx_http_image_filter_ctx_t *ctx;
|
|
|
458 ngx_http_image_filter_conf_t *conf;
|
|
|
459
|
|
|
460 r->connection->buffered &= ~NGX_HTTP_IMAGE_BUFFERED;
|
|
|
461
|
|
|
462 ctx = ngx_http_get_module_ctx(r, ngx_http_image_filter_module);
|
|
|
463
|
|
|
464 rc = ngx_http_image_size(r, ctx);
|
|
|
465
|
|
|
466 conf = ngx_http_get_module_loc_conf(r, ngx_http_image_filter_module);
|
|
|
467
|
|
|
468 if (conf->filter == NGX_HTTP_IMAGE_SIZE) {
|
|
|
469
|
|
|
470 b = ngx_http_image_json(r, rc == NGX_OK ? ctx : NULL);
|
|
|
471
|
|
|
472 } else if (rc == NGX_OK
|
|
|
473 && ctx->width <= conf->width
|
|
|
474 && ctx->height <= conf->height)
|
|
|
475 {
|
|
|
476 b = ngx_http_image_asis(r, ctx);
|
|
|
477
|
|
|
478 } else {
|
|
|
479 b = ngx_http_image_resize(r, ctx);
|
|
|
480 }
|
|
|
481
|
|
|
482 return b;
|
|
|
483 }
|
|
|
484
|
|
|
485
|
|
|
486 static ngx_buf_t *
|
|
|
487 ngx_http_image_json(ngx_http_request_t *r, ngx_http_image_filter_ctx_t *ctx)
|
|
|
488 {
|
|
|
489 size_t len;
|
|
|
490 ngx_buf_t *b;
|
|
|
491
|
|
|
492 b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t));
|
|
|
493 if (b == NULL) {
|
|
|
494 return NULL;
|
|
|
495 }
|
|
|
496
|
|
|
497 b->memory = 1;
|
|
|
498 b->last_buf = 1;
|
|
|
499
|
|
|
500 ngx_http_clean_header(r);
|
|
|
501
|
|
|
502 r->headers_out.status = NGX_HTTP_OK;
|
|
|
503 r->headers_out.content_type.len = sizeof("text/plain") - 1;
|
|
|
504 r->headers_out.content_type.data = (u_char *) "text/plain";
|
|
|
505
|
|
|
506 if (ctx == NULL) {
|
|
|
507 b->pos = (u_char *) "{}" CRLF;
|
|
|
508 b->last = b->pos + sizeof("{}" CRLF) - 1;
|
|
|
509
|
|
|
510 ngx_http_image_length(r, b);
|
|
|
511
|
|
|
512 return b;
|
|
|
513 }
|
|
|
514
|
|
|
515 len = sizeof("{ \"img\" : "
|
|
|
516 "{ \"width\": , \"height\": , \"type\": \"jpeg\" } }" CRLF) - 1
|
|
|
517 + 2 * NGX_SIZE_T_LEN;
|
|
|
518
|
|
|
519 b->pos = ngx_pnalloc(r->pool, len);
|
|
|
520 if (b->pos == NULL) {
|
|
|
521 return NULL;
|
|
|
522 }
|
|
|
523
|
|
|
524 b->last = ngx_sprintf(b->pos,
|
|
|
525 "{ \"img\" : "
|
|
|
526 "{ \"width\": %uz,"
|
|
|
527 " \"height\": %uz,"
|
|
|
528 " \"type\": \"%s\" } }" CRLF,
|
|
|
529 ctx->width, ctx->height,
|
|
|
530 ngx_http_image_types[ctx->type - 1].data + 6);
|
|
|
531
|
|
|
532 ngx_http_image_length(r, b);
|
|
|
533
|
|
|
534 return b;
|
|
|
535 }
|
|
|
536
|
|
|
537
|
|
|
538 static ngx_buf_t *
|
|
|
539 ngx_http_image_asis(ngx_http_request_t *r, ngx_http_image_filter_ctx_t *ctx)
|
|
|
540 {
|
|
|
541 ngx_buf_t *b;
|
|
|
542
|
|
|
543 b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t));
|
|
|
544 if (b == NULL) {
|
|
|
545 return NULL;
|
|
|
546 }
|
|
|
547
|
|
|
548 b->pos = ctx->image;
|
|
|
549 b->last = ctx->last;
|
|
|
550 b->memory = 1;
|
|
|
551 b->last_buf = 1;
|
|
|
552
|
|
|
553 ngx_http_image_length(r, b);
|
|
|
554
|
|
|
555 return b;
|
|
|
556 }
|
|
|
557
|
|
|
558
|
|
|
559 static void
|
|
|
560 ngx_http_image_length(ngx_http_request_t *r, ngx_buf_t *b)
|
|
|
561 {
|
|
|
562 r->headers_out.content_length_n = b->last - b->pos;
|
|
|
563
|
|
|
564 if (r->headers_out.content_length) {
|
|
|
565 r->headers_out.content_length->hash = 0;
|
|
|
566 }
|
|
|
567
|
|
|
568 r->headers_out.content_length = NULL;
|
|
|
569 }
|
|
|
570
|
|
|
571
|
|
|
572 static ngx_int_t
|
|
|
573 ngx_http_image_size(ngx_http_request_t *r, ngx_http_image_filter_ctx_t *ctx)
|
|
|
574 {
|
|
|
575 u_char *p, *last;
|
|
|
576 ngx_uint_t width, height;
|
|
|
577
|
|
|
578 p = ctx->image;
|
|
|
579
|
|
|
580 switch (ctx->type) {
|
|
|
581
|
|
|
582 case NGX_HTTP_IMAGE_JPEG:
|
|
|
583
|
|
|
584 p += 2;
|
|
|
585 last = ctx->image + ctx->length - 10;
|
|
|
586
|
|
|
587 while (p < last) {
|
|
|
588
|
|
|
589 if (p[0] == 0xff && p[1] != 0xff) {
|
|
|
590
|
|
|
591 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
|
|
|
592 "JPEG: %02xd %02xd", *p, *(p + 1));
|
|
|
593
|
|
|
594 p++;
|
|
|
595
|
|
|
596 if (*p == 0xc0 || *p == 0xc1 || *p == 0xc2 || *p == 0xc3
|
|
|
597 || *p == 0xc9 || *p == 0xca || *p == 0xcb)
|
|
|
598 {
|
|
|
599 goto found;
|
|
|
600 }
|
|
|
601
|
|
|
602 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
|
|
|
603 "JPEG: %02xd %02xd", p[1], p[2]);
|
|
|
604
|
|
|
605 p += p[1] * 256 + p[2];
|
|
|
606
|
|
|
607 continue;
|
|
|
608 }
|
|
|
609
|
|
|
610 p++;
|
|
|
611 }
|
|
|
612
|
|
|
613 return NGX_DECLINED;
|
|
|
614
|
|
|
615 found:
|
|
|
616
|
|
|
617 width = p[6] * 256 + p[7];
|
|
|
618 height = p[4] * 256 + p[5];
|
|
|
619
|
|
|
620 break;
|
|
|
621
|
|
|
622 case NGX_HTTP_IMAGE_GIF:
|
|
|
623
|
|
|
624 if (ctx->length < 10) {
|
|
|
625 return NGX_DECLINED;
|
|
|
626 }
|
|
|
627
|
|
|
628 width = p[7] * 256 + p[6];
|
|
|
629 height = p[9] * 256 + p[8];
|
|
|
630
|
|
|
631 break;
|
|
|
632
|
|
|
633 case NGX_HTTP_IMAGE_PNG:
|
|
|
634
|
|
|
635 if (ctx->length < 24) {
|
|
|
636 return NGX_DECLINED;
|
|
|
637 }
|
|
|
638
|
|
|
639 width = p[18] * 256 + p[19];
|
|
|
640 height = p[22] * 256 + p[23];
|
|
|
641
|
|
|
642 break;
|
|
|
643
|
|
|
644 default:
|
|
|
645
|
|
|
646 return NGX_DECLINED;
|
|
|
647 }
|
|
|
648
|
|
|
649 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
|
|
|
650 "image size: %d x %d", width, height);
|
|
|
651
|
|
|
652 ctx->width = width;
|
|
|
653 ctx->height = height;
|
|
|
654
|
|
|
655 return NGX_OK;
|
|
|
656 }
|
|
|
657
|
|
|
658
|
|
|
659 static ngx_buf_t *
|
|
|
660 ngx_http_image_resize(ngx_http_request_t *r, ngx_http_image_filter_ctx_t *ctx)
|
|
|
661 {
|
|
|
662 int sx, sy, dx, dy, ox, oy,
|
|
|
663 colors, transparent, size;
|
|
|
664 u_char *out;
|
|
|
665 ngx_buf_t *b;
|
|
|
666 ngx_uint_t resize;
|
|
|
667 gdImagePtr src, dst;
|
|
|
668 ngx_pool_cleanup_t *cln;
|
|
|
669 ngx_http_image_filter_conf_t *conf;
|
|
|
670
|
|
|
671 src = ngx_http_image_source(r, ctx);
|
|
|
672
|
|
|
673 if (src == NULL) {
|
|
|
674 return NULL;
|
|
|
675 }
|
|
|
676
|
|
|
677 sx = gdImageSX(src);
|
|
|
678 sy = gdImageSY(src);
|
|
|
679
|
|
|
680 conf = ngx_http_get_module_loc_conf(r, ngx_http_image_filter_module);
|
|
|
681
|
|
|
682 if ((ngx_uint_t) sx <= conf->width && (ngx_uint_t) sy <= conf->height) {
|
|
|
683 gdImageDestroy(src);
|
|
|
684 return ngx_http_image_asis(r, ctx);
|
|
|
685 }
|
|
|
686
|
|
|
687 colors = gdImageColorsTotal(src);
|
|
|
688 transparent = gdImageGetTransparent(src);
|
|
|
689
|
|
|
690 dx = sx;
|
|
|
691 dy = sy;
|
|
|
692
|
|
|
693 if (conf->filter == NGX_HTTP_IMAGE_RESIZE) {
|
|
|
694
|
|
|
695 if ((ngx_uint_t) dx > conf->width) {
|
|
|
696 dy = dy * conf->width / dx;
|
|
|
697 dy = dy ? dy : 1;
|
|
|
698 dx = conf->width;
|
|
|
699 }
|
|
|
700
|
|
|
701 if ((ngx_uint_t) dy > conf->height) {
|
|
|
702 dx = dx * conf->height / dy;
|
|
|
703 dx = dx ? dx : 1;
|
|
|
704 dy = conf->height;
|
|
|
705 }
|
|
|
706
|
|
|
707 resize = 1;
|
|
|
708
|
|
|
709 } else { /* NGX_HTTP_IMAGE_CROP */
|
|
|
710
|
|
|
711 resize = 0;
|
|
|
712
|
|
|
713 if ((ngx_uint_t) (dx * 100 / dy) < conf->width * 100 / conf->height) {
|
|
|
714
|
|
|
715 if ((ngx_uint_t) dx > conf->width) {
|
|
|
716 dy = dy * conf->width / dx;
|
|
|
717 dy = dy ? dy : 1;
|
|
|
718 dx = conf->width;
|
|
|
719 resize = 1;
|
|
|
720 }
|
|
|
721
|
|
|
722 } else {
|
|
|
723 if ((ngx_uint_t) dy > conf->height) {
|
|
|
724 dx = dx * conf->height / dy;
|
|
|
725 dx = dx ? dx : 1;
|
|
|
726 dy = conf->height;
|
|
|
727 resize = 1;
|
|
|
728 }
|
|
|
729 }
|
|
|
730 }
|
|
|
731
|
|
|
732 if (resize) {
|
|
|
733 dst = ngx_http_image_new(r, dx, dy, colors);
|
|
|
734 if (dst == NULL) {
|
|
|
735 gdImageDestroy(src);
|
|
|
736 return NULL;
|
|
|
737 }
|
|
|
738
|
|
|
739 gdImageCopyResampled(dst, src, 0, 0, 0, 0, dx, dy, sx, sy);
|
|
|
740
|
|
|
741 gdImageDestroy(src);
|
|
|
742
|
|
|
743 } else {
|
|
|
744 dst = src;
|
|
|
745 }
|
|
|
746
|
|
|
747 if (conf->filter == NGX_HTTP_IMAGE_CROP) {
|
|
|
748
|
|
|
749 src = dst;
|
|
|
750
|
|
|
751 if ((ngx_uint_t) dx > conf->width) {
|
|
|
752 ox = dx - conf->width;
|
|
|
753
|
|
|
754 } else {
|
|
|
755 ox = 0;
|
|
|
756 }
|
|
|
757
|
|
|
758 if ((ngx_uint_t) dy > conf->height) {
|
|
|
759 oy = dy - conf->height;
|
|
|
760
|
|
|
761 } else {
|
|
|
762 oy = 0;
|
|
|
763 }
|
|
|
764
|
|
|
765 if (ox || oy) {
|
|
|
766
|
|
|
767 dst = ngx_http_image_new(r, dx - ox, dy - oy, colors);
|
|
|
768
|
|
|
769 if (dst == NULL) {
|
|
|
770 gdImageDestroy(src);
|
|
|
771 return NULL;
|
|
|
772 }
|
|
|
773
|
|
|
774 ox /= 2;
|
|
|
775 oy /= 2;
|
|
|
776
|
|
|
777 ngx_log_debug4(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
|
|
|
778 "image crop: %d x %d @ %d x %d",
|
|
|
779 dx, dy, ox, oy);
|
|
|
780
|
|
|
781 gdImageCopy(dst, src, 0, 0, ox, oy, dx - ox, dy - oy);
|
|
|
782
|
|
|
783 gdImageDestroy(src);
|
|
|
784 }
|
|
|
785 }
|
|
|
786
|
|
|
787 gdImageColorTransparent(dst, transparent);
|
|
|
788
|
|
|
789 out = ngx_http_image_out(r, ctx->type, dst, &size);
|
|
|
790
|
|
|
791 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
|
|
|
792 "image: %d x %d %d", sx, sy, colors);
|
|
|
793
|
|
|
794 gdImageDestroy(dst);
|
|
|
795 ngx_pfree(r->pool, ctx->image);
|
|
|
796
|
|
|
797 if (out == NULL) {
|
|
|
798 return NULL;
|
|
|
799 }
|
|
|
800
|
|
|
801 cln = ngx_pool_cleanup_add(r->pool, 0);
|
|
|
802 if (cln == NULL) {
|
|
|
803 gdFree(out);
|
|
|
804 return NULL;
|
|
|
805 }
|
|
|
806
|
|
|
807 b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t));
|
|
|
808 if (b == NULL) {
|
|
|
809 gdFree(out);
|
|
|
810 return NULL;
|
|
|
811 }
|
|
|
812
|
|
|
813 cln->handler = ngx_http_image_cleanup;
|
|
|
814 cln->data = out;
|
|
|
815
|
|
|
816 b->pos = out;
|
|
|
817 b->last = out + size;
|
|
|
818 b->memory = 1;
|
|
|
819 b->last_buf = 1;
|
|
|
820
|
|
|
821 ngx_http_image_length(r, b);
|
|
|
822
|
|
|
823 return b;
|
|
|
824 }
|
|
|
825
|
|
|
826
|
|
|
827 static gdImagePtr
|
|
|
828 ngx_http_image_source(ngx_http_request_t *r, ngx_http_image_filter_ctx_t *ctx)
|
|
|
829 {
|
|
|
830 char *failed;
|
|
|
831 gdImagePtr img;
|
|
|
832
|
|
|
833 img = NULL;
|
|
|
834
|
|
|
835 switch (ctx->type) {
|
|
|
836
|
|
|
837 case NGX_HTTP_IMAGE_JPEG:
|
|
|
838 img = gdImageCreateFromJpegPtr(ctx->length, ctx->image);
|
|
|
839 failed = "gdImageCreateFromJpegPtr() failed";
|
|
|
840 break;
|
|
|
841
|
|
|
842 case NGX_HTTP_IMAGE_GIF:
|
|
|
843 img = gdImageCreateFromGifPtr(ctx->length, ctx->image);
|
|
|
844 failed = "gdImageCreateFromGifPtr() failed";
|
|
|
845 break;
|
|
|
846
|
|
|
847 case NGX_HTTP_IMAGE_PNG:
|
|
|
848 img = gdImageCreateFromPngPtr(ctx->length, ctx->image);
|
|
|
849 failed = "gdImageCreateFromPngPtr() failed";
|
|
|
850 break;
|
|
|
851
|
|
|
852 default:
|
|
|
853 failed = "unknown image type";
|
|
|
854 break;
|
|
|
855 }
|
|
|
856
|
|
|
857 if (img == NULL) {
|
|
|
858 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, failed);
|
|
|
859 }
|
|
|
860
|
|
|
861 return img;
|
|
|
862 }
|
|
|
863
|
|
|
864
|
|
|
865 static gdImagePtr
|
|
|
866 ngx_http_image_new(ngx_http_request_t *r, int w, int h, int colors)
|
|
|
867 {
|
|
|
868 gdImagePtr img;
|
|
|
869
|
|
|
870 if (colors == 0) {
|
|
|
871 img = gdImageCreateTrueColor(w, h);
|
|
|
872
|
|
|
873 if (img == NULL) {
|
|
|
874 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
|
|
|
875 "gdImageCreateTrueColor() failed");
|
|
|
876 return NULL;
|
|
|
877 }
|
|
|
878
|
|
|
879 } else {
|
|
|
880 img = gdImageCreate(w, h);
|
|
|
881
|
|
|
882 if (img == NULL) {
|
|
|
883 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
|
|
|
884 "gdImageCreate() failed");
|
|
|
885 return NULL;
|
|
|
886 }
|
|
|
887 }
|
|
|
888
|
|
|
889 return img;
|
|
|
890 }
|
|
|
891
|
|
|
892
|
|
|
893 static u_char *
|
|
|
894 ngx_http_image_out(ngx_http_request_t *r, ngx_uint_t type, gdImagePtr img,
|
|
|
895 int *size)
|
|
|
896 {
|
|
492
|
897 char *failed;
|
|
|
898 u_char *out;
|
|
|
899 ngx_http_image_filter_conf_t *conf;
|
|
484
|
900
|
|
|
901 out = NULL;
|
|
|
902
|
|
|
903 switch (type) {
|
|
|
904
|
|
|
905 case NGX_HTTP_IMAGE_JPEG:
|
|
492
|
906 conf = ngx_http_get_module_loc_conf(r, ngx_http_image_filter_module);
|
|
|
907 out = gdImageJpegPtr(img, size, conf->jpeg_quality);
|
|
484
|
908 failed = "gdImageJpegPtr() failed";
|
|
|
909 break;
|
|
|
910
|
|
|
911 case NGX_HTTP_IMAGE_GIF:
|
|
|
912 out = gdImageGifPtr(img, size);
|
|
|
913 failed = "gdImageGifPtr() failed";
|
|
|
914 break;
|
|
|
915
|
|
|
916 case NGX_HTTP_IMAGE_PNG:
|
|
|
917 out = gdImagePngPtr(img, size);
|
|
|
918 failed = "gdImagePngPtr() failed";
|
|
|
919 break;
|
|
|
920
|
|
|
921 default:
|
|
|
922 failed = "unknown image type";
|
|
|
923 break;
|
|
|
924 }
|
|
|
925
|
|
|
926 if (out == NULL) {
|
|
|
927 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, failed);
|
|
|
928 }
|
|
|
929
|
|
|
930 return out;
|
|
|
931 }
|
|
|
932
|
|
|
933
|
|
|
934 static void
|
|
|
935 ngx_http_image_cleanup(void *data)
|
|
|
936 {
|
|
|
937 gdFree(data);
|
|
|
938 }
|
|
|
939
|
|
|
940
|
|
|
941 static void *
|
|
|
942 ngx_http_image_filter_create_conf(ngx_conf_t *cf)
|
|
|
943 {
|
|
|
944 ngx_http_image_filter_conf_t *conf;
|
|
|
945
|
|
|
946 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_image_filter_conf_t));
|
|
|
947 if (conf == NULL) {
|
|
|
948 return NGX_CONF_ERROR;
|
|
|
949 }
|
|
|
950
|
|
|
951 conf->filter = NGX_CONF_UNSET_UINT;
|
|
492
|
952 conf->jpeg_quality = NGX_CONF_UNSET;
|
|
484
|
953 conf->buffer_size = NGX_CONF_UNSET_SIZE;
|
|
|
954
|
|
|
955 return conf;
|
|
|
956 }
|
|
|
957
|
|
|
958
|
|
|
959 static char *
|
|
|
960 ngx_http_image_filter_merge_conf(ngx_conf_t *cf, void *parent, void *child)
|
|
|
961 {
|
|
|
962 ngx_http_image_filter_conf_t *prev = parent;
|
|
|
963 ngx_http_image_filter_conf_t *conf = child;
|
|
|
964
|
|
|
965 if (conf->filter == NGX_CONF_UNSET_UINT) {
|
|
|
966
|
|
|
967 if (prev->filter == NGX_CONF_UNSET_UINT) {
|
|
|
968 conf->filter = NGX_HTTP_IMAGE_OFF;
|
|
|
969
|
|
|
970 } else {
|
|
|
971 conf->filter = prev->filter;
|
|
|
972 conf->width = prev->width;
|
|
|
973 conf->height = prev->height;
|
|
|
974 }
|
|
|
975 }
|
|
|
976
|
|
492
|
977 /* 75 is libjpeg default quality */
|
|
|
978 ngx_conf_merge_value(conf->jpeg_quality, prev->jpeg_quality, 75);
|
|
|
979
|
|
484
|
980 ngx_conf_merge_size_value(conf->buffer_size, prev->buffer_size,
|
|
|
981 1 * 1024 * 1024);
|
|
|
982
|
|
|
983 return NGX_CONF_OK;
|
|
|
984 }
|
|
|
985
|
|
|
986
|
|
|
987 static char *
|
|
|
988 ngx_http_image_filter(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
|
|
|
989 {
|
|
|
990 ngx_http_image_filter_conf_t *imcf = conf;
|
|
|
991
|
|
|
992 ngx_str_t *value;
|
|
|
993 ngx_int_t n;
|
|
|
994 ngx_uint_t i;
|
|
|
995
|
|
|
996 value = cf->args->elts;
|
|
|
997
|
|
|
998 i = 1;
|
|
|
999
|
|
|
1000 if (cf->args->nelts == 2) {
|
|
|
1001 if (ngx_strcmp(value[i].data, "off") == 0) {
|
|
|
1002 imcf->filter = NGX_HTTP_IMAGE_OFF;
|
|
|
1003
|
|
|
1004 } else if (ngx_strcmp(value[i].data, "test") == 0) {
|
|
|
1005 imcf->filter = NGX_HTTP_IMAGE_TEST;
|
|
|
1006
|
|
|
1007 } else if (ngx_strcmp(value[i].data, "size") == 0) {
|
|
|
1008 imcf->filter = NGX_HTTP_IMAGE_SIZE;
|
|
|
1009
|
|
|
1010 } else {
|
|
|
1011 goto failed;
|
|
|
1012 }
|
|
|
1013
|
|
|
1014 return NGX_CONF_OK;
|
|
|
1015 }
|
|
|
1016
|
|
|
1017 if (ngx_strcmp(value[i].data, "resize") == 0) {
|
|
|
1018 imcf->filter = NGX_HTTP_IMAGE_RESIZE;
|
|
|
1019
|
|
|
1020 } else if (ngx_strcmp(value[i].data, "crop") == 0) {
|
|
|
1021 imcf->filter = NGX_HTTP_IMAGE_CROP;
|
|
|
1022
|
|
|
1023 } else {
|
|
|
1024 goto failed;
|
|
|
1025 }
|
|
|
1026
|
|
|
1027 i++;
|
|
|
1028
|
|
|
1029 if (value[i].len == 1 && value[i].data[0] == '-') {
|
|
|
1030 imcf->width = (ngx_uint_t) -1;
|
|
|
1031
|
|
|
1032 } else {
|
|
|
1033 n = ngx_atoi(value[i].data, value[i].len);
|
|
|
1034 if (n == NGX_ERROR) {
|
|
|
1035 goto failed;
|
|
|
1036 }
|
|
|
1037
|
|
|
1038 imcf->width = (ngx_uint_t) n;
|
|
|
1039 }
|
|
|
1040
|
|
|
1041 i++;
|
|
|
1042
|
|
|
1043 if (value[i].len == 1 && value[i].data[0] == '-') {
|
|
|
1044 imcf->height = (ngx_uint_t) -1;
|
|
|
1045
|
|
|
1046 } else {
|
|
|
1047 n = ngx_atoi(value[i].data, value[i].len);
|
|
|
1048 if (n == NGX_ERROR) {
|
|
|
1049 goto failed;
|
|
|
1050 }
|
|
|
1051
|
|
|
1052 imcf->height = (ngx_uint_t) n;
|
|
|
1053 }
|
|
|
1054
|
|
|
1055 return NGX_CONF_OK;
|
|
|
1056
|
|
|
1057 failed:
|
|
|
1058
|
|
|
1059 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid parameter \"%V\"",
|
|
|
1060 &value[i]);
|
|
|
1061
|
|
|
1062 return NGX_CONF_ERROR;
|
|
|
1063 }
|
|
|
1064
|
|
|
1065
|
|
|
1066 static ngx_int_t
|
|
|
1067 ngx_http_image_filter_init(ngx_conf_t *cf)
|
|
|
1068 {
|
|
|
1069 ngx_http_next_header_filter = ngx_http_top_header_filter;
|
|
|
1070 ngx_http_top_header_filter = ngx_http_image_header_filter;
|
|
|
1071
|
|
|
1072 ngx_http_next_body_filter = ngx_http_top_body_filter;
|
|
|
1073 ngx_http_top_body_filter = ngx_http_image_body_filter;
|
|
|
1074
|
|
|
1075 return NGX_OK;
|
|
|
1076 }
|
