/* Copyright 2000-2004 The Apache Software Foundation * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #define CORE_PRIVATE #include "mod_cache.h" module AP_MODULE_DECLARE_DATA cache_module; APR_OPTIONAL_FN_TYPE(ap_cache_generate_key) *cache_generate_key; /* -------------------------------------------------------------- */ /* Handles for cache filters, resolved at startup to eliminate * a name-to-function mapping on each request */ static ap_filter_rec_t *cache_in_filter_handle; static ap_filter_rec_t *cache_out_filter_handle; static ap_filter_rec_t *cache_conditional_filter_handle; /* * CACHE handler * ------------- * * Can we deliver this request from the cache? * If yes: * deliver the content by installing the CACHE_OUT filter. * If no: * check whether we're allowed to try cache it * If yes: * add CACHE_IN filter * If No: * oh well. */ static int cache_url_handler(request_rec *r, int lookup) { apr_status_t rv; const char *cc_in, *pragma, *auth; apr_uri_t uri = r->parsed_uri; char *url = r->unparsed_uri; apr_size_t urllen; char *path = uri.path; const char *types; cache_info *info = NULL; cache_request_rec *cache; cache_server_conf *conf; conf = (cache_server_conf *) ap_get_module_config(r->server->module_config, &cache_module); /* we don't handle anything but GET */ if (r->method_number != M_GET) { return DECLINED; } /* * Which cache module (if any) should handle this request? */ if (!(types = ap_cache_get_cachetype(r, conf, path))) { return DECLINED; } urllen = strlen(url); if (urllen > MAX_URL_LENGTH) { ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server, "cache: URL exceeds length threshold: %s", url); return DECLINED; } /* DECLINE urls ending in / ??? EGP: why? */ if (url[urllen-1] == '/') { return DECLINED; } /* make space for the per request config */ cache = (cache_request_rec *) ap_get_module_config(r->request_config, &cache_module); if (!cache) { cache = apr_pcalloc(r->pool, sizeof(cache_request_rec)); ap_set_module_config(r->request_config, &cache_module, cache); } /* save away the type */ cache->types = types; /* * Are we allowed to serve cached info at all? */ /* find certain cache controlling headers */ cc_in = apr_table_get(r->headers_in, "Cache-Control"); pragma = apr_table_get(r->headers_in, "Pragma"); auth = apr_table_get(r->headers_in, "Authorization"); /* first things first - does the request allow us to return * cached information at all? If not, just decline the request. * * Note that there is a big difference between not being allowed * to cache a request (no-store) and not being allowed to return * a cached request without revalidation (max-age=0). * * Caching is forbidden under the following circumstances: * * - RFC2616 14.9.2 Cache-Control: no-store * - Pragma: no-cache * - Any requests requiring authorization. */ if (conf->ignorecachecontrol == 1 && auth == NULL) { ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server, "incoming request is asking for a uncached version of " "%s, but we know better and are ignoring it", url); } else { if (ap_cache_liststr(NULL, cc_in, "no-store", NULL) || ap_cache_liststr(NULL, pragma, "no-cache", NULL) || (auth != NULL)) { /* delete the previously cached file */ cache_remove_url(r, cache->types, url); ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server, "cache: no-store forbids caching of %s", url); return DECLINED; } } /* * Try to serve this request from the cache. * * If no existing cache file * add cache_in filter * If stale cache file * If conditional request * add cache_in filter * If non-conditional request * fudge response into a conditional * add cache_conditional filter * If fresh cache file * clear filter stack * add cache_out filter */ rv = cache_select_url(r, cache->types, url); if (DECLINED == rv) { if (!lookup) { /* no existing cache file */ ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server, "cache: no cache - add cache_in filter and DECLINE"); /* add cache_in filter to cache this request */ ap_add_output_filter_handle(cache_in_filter_handle, NULL, r, r->connection); } return DECLINED; } else if (OK == rv) { /* RFC2616 13.2 - Check cache object expiration */ cache->fresh = ap_cache_check_freshness(cache, r); if (cache->fresh) { /* fresh data available */ apr_bucket_brigade *out; conn_rec *c = r->connection; if (lookup) { return OK; } rv = ap_meets_conditions(r); if (rv != OK) { ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server, "cache: fresh cache - returning status %d", rv); return rv; } /* * Not a conditionl request. Serve up the content */ ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server, "cache: fresh cache - add cache_out filter and " "handle request"); /* We are in the quick handler hook, which means that no output * filters have been set. So lets run the insert_filter hook. */ ap_run_insert_filter(r); ap_add_output_filter_handle(cache_out_filter_handle, NULL, r, r->connection); /* kick off the filter stack */ out = apr_brigade_create(r->pool, c->bucket_alloc); if (APR_SUCCESS != (rv = ap_pass_brigade(r->output_filters, out))) { ap_log_error(APLOG_MARK, APLOG_ERR, rv, r->server, "cache: error returned while trying to return %s " "cached data", cache->type); return rv; } return OK; } else { if (!r->err_headers_out) { r->err_headers_out = apr_table_make(r->pool, 3); } /* stale data available */ if (lookup) { return DECLINED; } ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server, "cache: stale cache - test conditional"); /* if conditional request */ if (ap_cache_request_is_conditional(r)) { ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server, "cache: conditional - add cache_in filter and " "DECLINE"); /* Why not add CACHE_CONDITIONAL? */ ap_add_output_filter_handle(cache_in_filter_handle, NULL, r, r->connection); return DECLINED; } /* else if non-conditional request */ else { /* Temporarily hack this to work the way it had been. Its broken, * but its broken the way it was before. I'm working on figuring * out why the filter add in the conditional filter doesn't work. pjr * * info = &(cache->handle->cache_obj->info); * * Uncomment the above when the code in cache_conditional_filter_handle * is properly fixed... pjr */ /* fudge response into a conditional */ if (info && info->etag) { ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server, "cache: nonconditional - fudge conditional " "by etag"); /* if we have a cached etag */ apr_table_set(r->headers_in, "If-None-Match", info->etag); } else if (info && info->lastmods) { ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server, "cache: nonconditional - fudge conditional " "by lastmod"); /* if we have a cached IMS */ apr_table_set(r->headers_in, "If-Modified-Since", info->lastmods); } else { /* something else - pretend there was no cache */ ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server, "cache: nonconditional - no cached " "etag/lastmods - add cache_in and DECLINE"); ap_add_output_filter_handle(cache_in_filter_handle, NULL, r, r->connection); return DECLINED; } /* add cache_conditional filter */ ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server, "cache: nonconditional - add cache_conditional " "and DECLINE"); ap_add_output_filter_handle(cache_conditional_filter_handle, NULL, r, r->connection); return DECLINED; } } } else { /* error */ ap_log_error(APLOG_MARK, APLOG_ERR, rv, r->server, "cache: error returned while checking for cached file by " "%s cache", cache->type); return DECLINED; } } /* * CACHE_OUT filter * ---------------- * * Deliver cached content (headers and body) up the stack. */ static int cache_out_filter(ap_filter_t *f, apr_bucket_brigade *bb) { request_rec *r = f->r; cache_request_rec *cache; cache = (cache_request_rec *) ap_get_module_config(r->request_config, &cache_module); if (!cache) { /* user likely configured CACHE_OUT manually; they should use mod_cache * configuration to do that */ ap_log_error(APLOG_MARK, APLOG_ERR, 0, r->server, "CACHE_OUT enabled unexpectedly"); ap_remove_output_filter(f); return ap_pass_brigade(f->next, bb); } ap_log_error(APLOG_MARK, APLOG_DEBUG, APR_SUCCESS, r->server, "cache: running CACHE_OUT filter"); /* cache_read_entity_headers() was called in cache_select_url() */ cache_read_entity_body(cache->handle, r->pool, bb); /* This filter is done once it has served up its content */ ap_remove_output_filter(f); ap_log_error(APLOG_MARK, APLOG_DEBUG, APR_SUCCESS, r->server, "cache: serving %s", r->uri); return ap_pass_brigade(f->next, bb); } /* * CACHE_CONDITIONAL filter * ------------------------ * * Decide whether or not cached content should be delivered * based on our fudged conditional request. * If response HTTP_NOT_MODIFIED * replace ourselves with cache_out filter * Otherwise * replace ourselves with cache_in filter */ static int cache_conditional_filter(ap_filter_t *f, apr_bucket_brigade *in) { ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, f->r->server, "cache: running CACHE_CONDITIONAL filter"); if (f->r->status == HTTP_NOT_MODIFIED) { /* replace ourselves with CACHE_OUT filter */ ap_add_output_filter_handle(cache_out_filter_handle, NULL, f->r, f->r->connection); } else { /* replace ourselves with CACHE_IN filter */ ap_add_output_filter_handle(cache_in_filter_handle, NULL, f->r, f->r->connection); } ap_remove_output_filter(f); return ap_pass_brigade(f->next, in); } /* * CACHE_IN filter * --------------- * * Decide whether or not this content should be cached. * If we decide no it should: * remove the filter from the chain * If we decide yes it should: * pass the data to the storage manager * pass the data to the next filter (the network) * */ static int cache_in_filter(ap_filter_t *f, apr_bucket_brigade *in) { int rv; int date_in_errhdr = 0; request_rec *r = f->r; cache_request_rec *cache; cache_server_conf *conf; char *url = r->unparsed_uri; const char *cc_out, *cl; const char *exps, *lastmods, *dates, *etag; apr_time_t exp, date, lastmod, now; apr_off_t size; cache_info *info; char *reason; apr_pool_t *p; /* check first whether running this filter has any point or not */ if(r->no_cache) { ap_remove_output_filter(f); return ap_pass_brigade(f->next, in); } ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server, "cache: running CACHE_IN filter"); /* Setup cache_request_rec */ cache = (cache_request_rec *) ap_get_module_config(r->request_config, &cache_module); if (!cache) { cache = apr_pcalloc(r->pool, sizeof(cache_request_rec)); ap_set_module_config(r->request_config, &cache_module, cache); } reason = NULL; p = r->pool; /* * Pass Data to Cache * ------------------ * This section passes the brigades into the cache modules, but only * if the setup section (see below) is complete. */ /* have we already run the cachability check and set up the * cached file handle? */ if (cache->in_checked) { /* pass the brigades into the cache, then pass them * up the filter stack */ rv = cache_write_entity_body(cache->handle, r, in); if (rv != APR_SUCCESS) { ap_remove_output_filter(f); } return ap_pass_brigade(f->next, in); } /* * Setup Data in Cache * ------------------- * This section opens the cache entity and sets various caching * parameters, and decides whether this URL should be cached at * all. This section is* run before the above section. */ info = apr_pcalloc(r->pool, sizeof(cache_info)); /* read expiry date; if a bad date, then leave it so the client can * read it */ exps = apr_table_get(r->err_headers_out, "Expires"); if (exps == NULL) { exps = apr_table_get(r->headers_out, "Expires"); } if (exps != NULL) { if (APR_DATE_BAD == (exp = apr_date_parse_http(exps))) { exps = NULL; } } else { exp = APR_DATE_BAD; } /* read the last-modified date; if the date is bad, then delete it */ lastmods = apr_table_get(r->err_headers_out, "Last-Modified"); if (lastmods ==NULL) { lastmods = apr_table_get(r->headers_out, "Last-Modified"); } if (lastmods != NULL) { if (APR_DATE_BAD == (lastmod = apr_date_parse_http(lastmods))) { lastmods = NULL; } } else { lastmod = APR_DATE_BAD; } conf = (cache_server_conf *) ap_get_module_config(r->server->module_config, &cache_module); /* read the etag and cache-control from the entity */ etag = apr_table_get(r->err_headers_out, "Etag"); if (etag == NULL) { etag = apr_table_get(r->headers_out, "Etag"); } cc_out = apr_table_get(r->err_headers_out, "Cache-Control"); if (cc_out == NULL) { cc_out = apr_table_get(r->headers_out, "Cache-Control"); } /* * what responses should we not cache? * * At this point we decide based on the response headers whether it * is appropriate _NOT_ to cache the data from the server. There are * a whole lot of conditions that prevent us from caching this data. * They are tested here one by one to be clear and unambiguous. */ if (r->status != HTTP_OK && r->status != HTTP_NON_AUTHORITATIVE && r->status != HTTP_MULTIPLE_CHOICES && r->status != HTTP_MOVED_PERMANENTLY && r->status != HTTP_NOT_MODIFIED) { /* RFC2616 13.4 we are allowed to cache 200, 203, 206, 300, 301 or 410 * We don't cache 206, because we don't (yet) cache partial responses. * We include 304 Not Modified here too as this is the origin server * telling us to serve the cached copy. */ reason = apr_psprintf(p, "Response status %d", r->status); } else if (exps != NULL && exp == APR_DATE_BAD) { /* if a broken Expires header is present, don't cache it */ reason = apr_pstrcat(p, "Broken expires header: ", exps, NULL); } else if (r->args && exps == NULL) { /* if query string present but no expiration time, don't cache it * (RFC 2616/13.9) */ reason = "Query string present but no expires header"; } else if (r->status == HTTP_NOT_MODIFIED && (NULL == cache->handle)) { /* if the server said 304 Not Modified but we have no cache * file - pass this untouched to the user agent, it's not for us. */ reason = "HTTP Status 304 Not Modified"; } else if (r->status == HTTP_OK && lastmods == NULL && etag == NULL && (exps == NULL) && (conf->no_last_mod_ignore ==0)) { /* 200 OK response from HTTP/1.0 and up without Last-Modified, * Etag, or Expires headers. */ /* Note: mod-include clears last_modified/expires/etags - this * is why we have an optional function for a key-gen ;-) */ reason = "No Last-Modified, Etag, or Expires headers"; } else if (r->header_only) { /* HEAD requests */ reason = "HTTP HEAD request"; } else if (ap_cache_liststr(NULL, cc_out, "no-store", NULL)) { /* RFC2616 14.9.2 Cache-Control: no-store response * indicating do not cache, or stop now if you are * trying to cache it */ reason = "Cache-Control: no-store present"; } else if (ap_cache_liststr(NULL, cc_out, "private", NULL)) { /* RFC2616 14.9.1 Cache-Control: private * this object is marked for this user's eyes only. Behave * as a tunnel. */ reason = "Cache-Control: private present"; } else if (apr_table_get(r->headers_in, "Authorization") != NULL && !(ap_cache_liststr(NULL, cc_out, "s-maxage", NULL) || ap_cache_liststr(NULL, cc_out, "must-revalidate", NULL) || ap_cache_liststr(NULL, cc_out, "public", NULL))) { /* RFC2616 14.8 Authorisation: * if authorisation is included in the request, we don't cache, * but we can cache if the following exceptions are true: * 1) If Cache-Control: s-maxage is included * 2) If Cache-Control: must-revalidate is included * 3) If Cache-Control: public is included */ reason = "Authorization required"; } else if (r->no_cache) { /* or we've been asked not to cache it above */ reason = "no_cache present"; } if (reason) { ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server, "cache: %s not cached. Reason: %s", url, reason); /* remove this object from the cache * BillS Asks.. Why do we need to make this call to remove_url? * leave it in for now.. */ cache_remove_url(r, cache->types, url); /* remove this filter from the chain */ ap_remove_output_filter(f); /* ship the data up the stack */ return ap_pass_brigade(f->next, in); } cache->in_checked = 1; /* Set the content length if known. */ cl = apr_table_get(r->err_headers_out, "Content-Length"); if (cl == NULL) { cl = apr_table_get(r->headers_out, "Content-Length"); } if (cl) { size = apr_atoi64(cl); } else { /* if we don't get the content-length, see if we have all the * buckets and use their length to calculate the size */ apr_bucket *e; int all_buckets_here=0; int unresolved_length = 0; size=0; for (e = APR_BRIGADE_FIRST(in); e != APR_BRIGADE_SENTINEL(in); e = APR_BUCKET_NEXT(e)) { if (APR_BUCKET_IS_EOS(e)) { all_buckets_here=1; break; } if (APR_BUCKET_IS_FLUSH(e)) { unresolved_length = 1; continue; } if (e->length == (apr_size_t)-1) { break; } size += e->length; } if (!all_buckets_here) { size = -1; } } /* It's safe to cache the response. * * There are two possiblities at this point: * - cache->handle == NULL. In this case there is no previously * cached entity anywhere on the system. We must create a brand * new entity and store the response in it. * - cache->handle != NULL. In this case there is a stale * entity in the system which needs to be replaced by new * content (unless the result was 304 Not Modified, which means * the cached entity is actually fresh, and we should update * the headers). */ /* no cache handle, create a new entity */ if (!cache->handle) { rv = cache_create_entity(r, cache->types, url, size); } /* pre-existing cache handle and 304, make entity fresh */ else if (r->status == HTTP_NOT_MODIFIED) { /* update headers: TODO */ /* remove this filter ??? */ /* XXX is this right? we must set rv to something other than OK * in this path */ rv = HTTP_NOT_MODIFIED; } /* pre-existing cache handle and new entity, replace entity * with this one */ else { cache_remove_entity(r, cache->types, cache->handle); rv = cache_create_entity(r, cache->types, url, size); } if (rv != OK) { /* Caching layer declined the opportunity to cache the response */ ap_remove_output_filter(f); return ap_pass_brigade(f->next, in); } ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server, "cache: Caching url: %s", url); /* * We now want to update the cache file header information with * the new date, last modified, expire and content length and write * it away to our cache file. First, we determine these values from * the response, using heuristics if appropriate. * * In addition, we make HTTP/1.1 age calculations and write them away * too. */ /* Read the date. Generate one if one is not supplied */ dates = apr_table_get(r->err_headers_out, "Date"); if (dates != NULL) { date_in_errhdr = 1; } else { dates = apr_table_get(r->headers_out, "Date"); } if (dates != NULL) { info->date = apr_date_parse_http(dates); } else { info->date = APR_DATE_BAD; } now = apr_time_now(); if (info->date == APR_DATE_BAD) { /* No, or bad date */ char *dates; /* no date header (or bad header)! */ /* add one; N.B. use the time _now_ rather than when we were checking * the cache */ if (date_in_errhdr == 1) { apr_table_unset(r->err_headers_out, "Date"); } date = now; dates = apr_pcalloc(r->pool, MAX_STRING_LEN); apr_rfc822_date(dates, now); apr_table_set(r->headers_out, "Date", dates); ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server, "cache: Added date header"); info->date = date; } else { date = info->date; } /* set response_time for HTTP/1.1 age calculations */ info->response_time = now; /* get the request time */ info->request_time = r->request_time; /* check last-modified date */ if (lastmod != APR_DATE_BAD && lastmod > date) { /* if it's in the future, then replace by date */ lastmod = date; lastmods = dates; ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server, "cache: Last modified is in the future, " "replacing with now"); } info->lastmod = lastmod; /* if no expiry date then * if lastmod * expiry date = date + min((date - lastmod) * factor, maxexpire) * else * expire date = date + defaultexpire */ if (exp == APR_DATE_BAD) { /* if lastmod == date then you get 0*conf->factor which results in * an expiration time of now. This causes some problems with * freshness calculations, so we choose the else path... */ if ((lastmod != APR_DATE_BAD) && (lastmod < date)) { apr_time_t x = (apr_time_t) ((date - lastmod) * conf->factor); if (x > conf->maxex) { x = conf->maxex; } exp = date + x; } else { exp = date + conf->defex; } } info->expire = exp; info->content_type = apr_pstrdup(r->pool, r->content_type); info->etag = apr_pstrdup(r->pool, etag); info->lastmods = apr_pstrdup(r->pool, lastmods); info->filename = apr_pstrdup(r->pool, r->filename ); /* * Write away header information to cache. */ rv = cache_write_entity_headers(cache->handle, r, info); if (rv == APR_SUCCESS) { rv = cache_write_entity_body(cache->handle, r, in); } if (rv != APR_SUCCESS) { ap_remove_output_filter(f); } return ap_pass_brigade(f->next, in); } /* -------------------------------------------------------------- */ /* Setup configurable data */ static void * create_cache_config(apr_pool_t *p, server_rec *s) { cache_server_conf *ps = apr_pcalloc(p, sizeof(cache_server_conf)); /* array of URL prefixes for which caching is enabled */ ps->cacheenable = apr_array_make(p, 10, sizeof(struct cache_enable)); /* array of URL prefixes for which caching is disabled */ ps->cachedisable = apr_array_make(p, 10, sizeof(struct cache_disable)); /* maximum time to cache a document */ ps->maxex = DEFAULT_CACHE_MAXEXPIRE; ps->maxex_set = 0; /* default time to cache a document */ ps->defex = DEFAULT_CACHE_EXPIRE; ps->defex_set = 0; /* factor used to estimate Expires date from LastModified date */ ps->factor = DEFAULT_CACHE_LMFACTOR; ps->factor_set = 0; /* default percentage to force cache completion */ ps->complete = DEFAULT_CACHE_COMPLETION; ps->complete_set = 0; ps->no_last_mod_ignore_set = 0; ps->no_last_mod_ignore = 0; ps->ignorecachecontrol = 0; ps->ignorecachecontrol_set = 0 ; return ps; } static void * merge_cache_config(apr_pool_t *p, void *basev, void *overridesv) { cache_server_conf *ps = apr_pcalloc(p, sizeof(cache_server_conf)); cache_server_conf *base = (cache_server_conf *) basev; cache_server_conf *overrides = (cache_server_conf *) overridesv; /* array of URL prefixes for which caching is disabled */ ps->cachedisable = apr_array_append(p, base->cachedisable, overrides->cachedisable); /* array of URL prefixes for which caching is enabled */ ps->cacheenable = apr_array_append(p, base->cacheenable, overrides->cacheenable); /* maximum time to cache a document */ ps->maxex = (overrides->maxex_set == 0) ? base->maxex : overrides->maxex; /* default time to cache a document */ ps->defex = (overrides->defex_set == 0) ? base->defex : overrides->defex; /* factor used to estimate Expires date from LastModified date */ ps->factor = (overrides->factor_set == 0) ? base->factor : overrides->factor; /* default percentage to force cache completion */ ps->complete = (overrides->complete_set == 0) ? base->complete : overrides->complete; ps->no_last_mod_ignore = (overrides->no_last_mod_ignore_set == 0) ? base->no_last_mod_ignore : overrides->no_last_mod_ignore; ps->ignorecachecontrol = (overrides->ignorecachecontrol_set == 0) ? base->ignorecachecontrol : overrides->ignorecachecontrol; return ps; } static const char *set_cache_ignore_no_last_mod(cmd_parms *parms, void *dummy, int flag) { cache_server_conf *conf; conf = (cache_server_conf *)ap_get_module_config(parms->server->module_config, &cache_module); conf->no_last_mod_ignore = flag; conf->no_last_mod_ignore_set = 1; return NULL; } static const char *set_cache_ignore_cachecontrol(cmd_parms *parms, void *dummy, int flag) { cache_server_conf *conf; conf = (cache_server_conf *)ap_get_module_config(parms->server->module_config, &cache_module); conf->ignorecachecontrol = flag; conf->ignorecachecontrol_set = 1; return NULL; } static const char *add_cache_enable(cmd_parms *parms, void *dummy, const char *type, const char *url) { cache_server_conf *conf; struct cache_enable *new; conf = (cache_server_conf *)ap_get_module_config(parms->server->module_config, &cache_module); new = apr_array_push(conf->cacheenable); new->type = type; new->url = url; return NULL; } static const char *add_cache_disable(cmd_parms *parms, void *dummy, const char *url) { cache_server_conf *conf; struct cache_enable *new; conf = (cache_server_conf *)ap_get_module_config(parms->server->module_config, &cache_module); new = apr_array_push(conf->cachedisable); new->url = url; return NULL; } static const char *set_cache_maxex(cmd_parms *parms, void *dummy, const char *arg) { cache_server_conf *conf; conf = (cache_server_conf *)ap_get_module_config(parms->server->module_config, &cache_module); conf->maxex = (apr_time_t) (atol(arg) * MSEC_ONE_SEC); conf->maxex_set = 1; return NULL; } static const char *set_cache_defex(cmd_parms *parms, void *dummy, const char *arg) { cache_server_conf *conf; conf = (cache_server_conf *)ap_get_module_config(parms->server->module_config, &cache_module); conf->defex = (apr_time_t) (atol(arg) * MSEC_ONE_SEC); conf->defex_set = 1; return NULL; } static const char *set_cache_factor(cmd_parms *parms, void *dummy, const char *arg) { cache_server_conf *conf; double val; conf = (cache_server_conf *)ap_get_module_config(parms->server->module_config, &cache_module); if (sscanf(arg, "%lg", &val) != 1) { return "CacheLastModifiedFactor value must be a float"; } conf->factor = val; conf->factor_set = 1; return NULL; } static const char *set_cache_complete(cmd_parms *parms, void *dummy, const char *arg) { cache_server_conf *conf; int val; conf = (cache_server_conf *)ap_get_module_config(parms->server->module_config, &cache_module); if (sscanf(arg, "%u", &val) != 1) { return "CacheForceCompletion value must be a percentage"; } conf->complete = val; conf->complete_set = 1; return NULL; } static int cache_post_config(apr_pool_t *p, apr_pool_t *plog, apr_pool_t *ptemp, server_rec *s) { /* This is the means by which unusual (non-unix) os's may find alternate * means to run a given command (e.g. shebang/registry parsing on Win32) */ cache_generate_key = APR_RETRIEVE_OPTIONAL_FN(ap_cache_generate_key); if (!cache_generate_key) { cache_generate_key = cache_generate_key_default; } return OK; } static const command_rec cache_cmds[] = { /* XXX * Consider a new config directive that enables loading specific cache * implememtations (like mod_cache_mem, mod_cache_file, etc.). * Rather than using a LoadModule directive, admin would use something * like CacheModule mem_cache_module | file_cache_module, etc, * which would cause the approprpriate cache module to be loaded. * This is more intuitive that requiring a LoadModule directive. */ AP_INIT_TAKE2("CacheEnable", add_cache_enable, NULL, RSRC_CONF, "A cache type and partial URL prefix below which " "caching is enabled"), AP_INIT_TAKE1("CacheDisable", add_cache_disable, NULL, RSRC_CONF, "A partial URL prefix below which caching is disabled"), AP_INIT_TAKE1("CacheMaxExpire", set_cache_maxex, NULL, RSRC_CONF, "The maximum time in seconds to cache a document"), AP_INIT_TAKE1("CacheDefaultExpire", set_cache_defex, NULL, RSRC_CONF, "The default time in seconds to cache a document"), AP_INIT_FLAG("CacheIgnoreNoLastMod", set_cache_ignore_no_last_mod, NULL, RSRC_CONF, "Ignore Responses where there is no Last Modified Header"), AP_INIT_FLAG("CacheIgnoreCacheControl", set_cache_ignore_cachecontrol, NULL, RSRC_CONF, "Ignore requests from the client for uncached content"), AP_INIT_TAKE1("CacheLastModifiedFactor", set_cache_factor, NULL, RSRC_CONF, "The factor used to estimate Expires date from " "LastModified date"), AP_INIT_TAKE1("CacheForceCompletion", set_cache_complete, NULL, RSRC_CONF, "Percentage of download to arrive for the cache to force " "complete transfer"), {NULL} }; static void register_hooks(apr_pool_t *p) { /* cache initializer */ /* cache handler */ ap_hook_quick_handler(cache_url_handler, NULL, NULL, APR_HOOK_FIRST); /* cache filters * XXX The cache filters need to run right after the handlers and before * any other filters. Consider creating AP_FTYPE_CACHE for this purpose. * Make them AP_FTYPE_CONTENT for now. * XXX ianhH:they should run AFTER all the other content filters. */ cache_in_filter_handle = ap_register_output_filter("CACHE_IN", cache_in_filter, NULL, AP_FTYPE_CONTENT_SET-1); /* CACHE_OUT must go into the filter chain before SUBREQ_CORE to * handle subrequsts. Decrementing filter type by 1 ensures this * happens. */ cache_out_filter_handle = ap_register_output_filter("CACHE_OUT", cache_out_filter, NULL, AP_FTYPE_CONTENT_SET-1); cache_conditional_filter_handle = ap_register_output_filter("CACHE_CONDITIONAL", cache_conditional_filter, NULL, AP_FTYPE_CONTENT_SET); ap_hook_post_config(cache_post_config, NULL, NULL, APR_HOOK_REALLY_FIRST); } module AP_MODULE_DECLARE_DATA cache_module = { STANDARD20_MODULE_STUFF, NULL, /* create per-directory config structure */ NULL, /* merge per-directory config structures */ create_cache_config, /* create per-server config structure */ merge_cache_config, /* merge per-server config structures */ cache_cmds, /* command apr_table_t */ register_hooks };