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