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