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annotate src/http/modules/ngx_http_not_modified_filter_module.c @ 4743:84cc73e01aa8

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Not modified filter: tests separated from actions. This makes code more extendable. The only functional change is when If-Modified-Since and If-Unmodified-Since are specified together, the case which is explicitly left undefined by RFC 2616. The new behaviour is to respect them both, which seems better.
author Maxim Dounin <mdounin@mdounin.ru>
date Sat, 07 Jul 2012 21:18:30 +0000
parents d620f497c50f
children 5b93a9ac60ed
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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da8c5707af39 nginx-0.1.0-2004-09-28-12:34:51 import; set copyright and remove unused files
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1
da8c5707af39 nginx-0.1.0-2004-09-28-12:34:51 import; set copyright and remove unused files
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2 /*
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42d11f017717 nginx-0.1.0-2004-09-29-20:00:49 import; remove years from copyright
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3 * Copyright (C) Igor Sysoev
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4 * Copyright (C) Nginx, Inc.
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5 */
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6
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e29909bd9b8a nginx-0.0.1-2003-09-28-23:29:06 import
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7
e29909bd9b8a nginx-0.0.1-2003-09-28-23:29:06 import
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8 #include <ngx_config.h>
e29909bd9b8a nginx-0.0.1-2003-09-28-23:29:06 import
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9 #include <ngx_core.h>
e29909bd9b8a nginx-0.0.1-2003-09-28-23:29:06 import
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10 #include <ngx_http.h>
e29909bd9b8a nginx-0.0.1-2003-09-28-23:29:06 import
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e29909bd9b8a nginx-0.0.1-2003-09-28-23:29:06 import
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12
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13 static ngx_uint_t ngx_http_test_if_unmodified(ngx_http_request_t *r);
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14 static ngx_uint_t ngx_http_test_if_modified(ngx_http_request_t *r);
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15 static ngx_int_t ngx_http_not_modified_filter_init(ngx_conf_t *cf);
135
e29909bd9b8a nginx-0.0.1-2003-09-28-23:29:06 import
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16
e29909bd9b8a nginx-0.0.1-2003-09-28-23:29:06 import
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17
e29909bd9b8a nginx-0.0.1-2003-09-28-23:29:06 import
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18 static ngx_http_module_t ngx_http_not_modified_filter_module_ctx = {
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19 NULL, /* preconfiguration */
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20 ngx_http_not_modified_filter_init, /* postconfiguration */
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21
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22 NULL, /* create main configuration */
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23 NULL, /* init main configuration */
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24
e29909bd9b8a nginx-0.0.1-2003-09-28-23:29:06 import
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25 NULL, /* create server configuration */
e29909bd9b8a nginx-0.0.1-2003-09-28-23:29:06 import
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26 NULL, /* merge server configuration */
e29909bd9b8a nginx-0.0.1-2003-09-28-23:29:06 import
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27
e29909bd9b8a nginx-0.0.1-2003-09-28-23:29:06 import
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28 NULL, /* create location configuration */
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29 NULL /* merge location configuration */
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30 };
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31
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32
e29909bd9b8a nginx-0.0.1-2003-09-28-23:29:06 import
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33 ngx_module_t ngx_http_not_modified_filter_module = {
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34 NGX_MODULE_V1,
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35 &ngx_http_not_modified_filter_module_ctx, /* module context */
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36 NULL, /* module directives */
e29909bd9b8a nginx-0.0.1-2003-09-28-23:29:06 import
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37 NGX_HTTP_MODULE, /* module type */
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38 NULL, /* init master */
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39 NULL, /* init module */
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40 NULL, /* init process */
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41 NULL, /* init thread */
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42 NULL, /* exit thread */
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43 NULL, /* exit process */
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44 NULL, /* exit master */
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45 NGX_MODULE_V1_PADDING
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46 };
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47
e29909bd9b8a nginx-0.0.1-2003-09-28-23:29:06 import
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48
155
46eb23d9471d nginx-0.0.1-2003-10-22-20:38:26 import
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49 static ngx_http_output_header_filter_pt ngx_http_next_header_filter;
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50
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51
2702
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52 static ngx_int_t
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53 ngx_http_not_modified_header_filter(ngx_http_request_t *r)
135
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54 {
e29909bd9b8a nginx-0.0.1-2003-09-28-23:29:06 import
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55 if (r->headers_out.status != NGX_HTTP_OK
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56 || r != r->main
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cb77c084acdb nginx-0.0.1-2003-10-09-11:00:45 import
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57 || r->headers_out.last_modified_time == -1)
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58 {
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59 return ngx_http_next_header_filter(r);
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60 }
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61
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62 if (r->headers_in.if_unmodified_since
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63 && !ngx_http_test_if_unmodified(r))
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64 {
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65 return ngx_http_filter_finalize_request(r, NULL,
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66 NGX_HTTP_PRECONDITION_FAILED);
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67 }
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68
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69 if (r->headers_in.if_modified_since
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70 && !ngx_http_test_if_modified(r))
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71 {
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72 /* not modified */
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73
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74 r->headers_out.status = NGX_HTTP_NOT_MODIFIED;
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75 r->headers_out.status_line.len = 0;
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76 r->headers_out.content_type.len = 0;
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77 ngx_http_clear_content_length(r);
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78 ngx_http_clear_accept_ranges(r);
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79
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80 if (r->headers_out.content_encoding) {
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81 r->headers_out.content_encoding->hash = 0;
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82 r->headers_out.content_encoding = NULL;
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83 }
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84
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85 return ngx_http_next_header_filter(r);
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86 }
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87
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88 return ngx_http_next_header_filter(r);
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89 }
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90
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91
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92 static ngx_uint_t
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93 ngx_http_test_if_unmodified(ngx_http_request_t *r)
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94 {
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95 time_t iums;
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96
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97 iums = ngx_http_parse_time(r->headers_in.if_unmodified_since->value.data,
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98 r->headers_in.if_unmodified_since->value.len);
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99
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100 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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101 "http iums:%d lm:%d", iums, r->headers_out.last_modified_time);
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102
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103 if (iums >= r->headers_out.last_modified_time) {
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104 return 1;
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105 }
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106
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107 return 0;
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108 }
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109
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110
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111 static ngx_uint_t
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112 ngx_http_test_if_modified(ngx_http_request_t *r)
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113 {
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114 time_t ims;
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115 ngx_http_core_loc_conf_t *clcf;
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116
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117 clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
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118
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119 if (clcf->if_modified_since == NGX_HTTP_IMS_OFF) {
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120 return 1;
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121 }
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122
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123 ims = ngx_http_parse_time(r->headers_in.if_modified_since->value.data,
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124 r->headers_in.if_modified_since->value.len);
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125
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126 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
70e1c7d2b83d nginx-0.0.2-2004-02-11-20:08:49 import
Igor Sysoev <igor@sysoev.ru>
parents: 195
diff changeset
127 "http ims:%d lm:%d", ims, r->headers_out.last_modified_time);
135
e29909bd9b8a nginx-0.0.1-2003-09-28-23:29:06 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
128
4743
84cc73e01aa8 Not modified filter: tests separated from actions.
Maxim Dounin <mdounin@mdounin.ru>
parents: 4412
diff changeset
129 if (ims == r->headers_out.last_modified_time) {
84cc73e01aa8 Not modified filter: tests separated from actions.
Maxim Dounin <mdounin@mdounin.ru>
parents: 4412
diff changeset
130 return 0;
135
e29909bd9b8a nginx-0.0.1-2003-09-28-23:29:06 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
131 }
e29909bd9b8a nginx-0.0.1-2003-09-28-23:29:06 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
132
4743
84cc73e01aa8 Not modified filter: tests separated from actions.
Maxim Dounin <mdounin@mdounin.ru>
parents: 4412
diff changeset
133 if (clcf->if_modified_since == NGX_HTTP_IMS_EXACT
84cc73e01aa8 Not modified filter: tests separated from actions.
Maxim Dounin <mdounin@mdounin.ru>
parents: 4412
diff changeset
134 || ims < r->headers_out.last_modified_time)
84cc73e01aa8 Not modified filter: tests separated from actions.
Maxim Dounin <mdounin@mdounin.ru>
parents: 4412
diff changeset
135 {
84cc73e01aa8 Not modified filter: tests separated from actions.
Maxim Dounin <mdounin@mdounin.ru>
parents: 4412
diff changeset
136 return 1;
3308
793ae4dd91e9 remove "Content-Encoding: gzip" in 304 response
Igor Sysoev <igor@sysoev.ru>
parents: 2702
diff changeset
137 }
793ae4dd91e9 remove "Content-Encoding: gzip" in 304 response
Igor Sysoev <igor@sysoev.ru>
parents: 2702
diff changeset
138
4743
84cc73e01aa8 Not modified filter: tests separated from actions.
Maxim Dounin <mdounin@mdounin.ru>
parents: 4412
diff changeset
139 return 0;
135
e29909bd9b8a nginx-0.0.1-2003-09-28-23:29:06 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
140 }
e29909bd9b8a nginx-0.0.1-2003-09-28-23:29:06 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
141
e29909bd9b8a nginx-0.0.1-2003-09-28-23:29:06 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
142
2702
eace65d6092b style fix
Igor Sysoev <igor@sysoev.ru>
parents: 2592
diff changeset
143 static ngx_int_t
eace65d6092b style fix
Igor Sysoev <igor@sysoev.ru>
parents: 2592
diff changeset
144 ngx_http_not_modified_filter_init(ngx_conf_t *cf)
135
e29909bd9b8a nginx-0.0.1-2003-09-28-23:29:06 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
145 {
155
46eb23d9471d nginx-0.0.1-2003-10-22-20:38:26 import
Igor Sysoev <igor@sysoev.ru>
parents: 153
diff changeset
146 ngx_http_next_header_filter = ngx_http_top_header_filter;
135
e29909bd9b8a nginx-0.0.1-2003-09-28-23:29:06 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
147 ngx_http_top_header_filter = ngx_http_not_modified_header_filter;
e29909bd9b8a nginx-0.0.1-2003-09-28-23:29:06 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
148
e29909bd9b8a nginx-0.0.1-2003-09-28-23:29:06 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
149 return NGX_OK;
e29909bd9b8a nginx-0.0.1-2003-09-28-23:29:06 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
150 }