diff options
Diffstat (limited to 'src/http/modules/ngx_http_rewrite_handler.c')
| -rw-r--r-- | src/http/modules/ngx_http_rewrite_handler.c | 340 |
1 files changed, 340 insertions, 0 deletions
diff --git a/src/http/modules/ngx_http_rewrite_handler.c b/src/http/modules/ngx_http_rewrite_handler.c new file mode 100644 index 000000000..03414aad7 --- /dev/null +++ b/src/http/modules/ngx_http_rewrite_handler.c @@ -0,0 +1,340 @@ + +#include <ngx_config.h> +#include <ngx_core.h> +#include <ngx_http.h> + + +#define NGX_HTTP_REWRITE_COPY_MATCH 0 +#define NGX_HTTP_REWRITE_COPY_SHORT 1 +#define NGX_HTTP_REWRITE_COPY_LONG 2 + + +typedef struct { + ngx_int_t op; + size_t len; + uintptr_t data; +} ngx_http_rewrite_op_t; + + +typedef struct { + ngx_regex_t *regex; + ngx_uint_t msize; + + ngx_array_t ops; + ngx_uint_t size; + + ngx_str_t re_name; + ngx_str_t s_name; + + unsigned last:1; +} ngx_http_rewrite_rule_t; + + +typedef struct { + ngx_array_t rules; + unsigned log:1; +} ngx_http_rewrite_srv_conf_t; + + +static void *ngx_http_rewrite_create_loc_conf(ngx_conf_t *cf); +static char *ngx_http_rewrite_rule(ngx_conf_t *cf, ngx_command_t *cmd, + void *conf); +static ngx_int_t ngx_http_rewrite_init(ngx_cycle_t *cycle); + + +static ngx_command_t ngx_http_rewrite_commands[] = { + + { ngx_string("rewrite"), + NGX_HTTP_SRV_CONF|NGX_CONF_TAKE23, + ngx_http_rewrite_rule, + NGX_HTTP_SRV_CONF_OFFSET, + 0, + NULL }, + + ngx_null_command +}; + + +ngx_http_module_t ngx_http_rewrite_module_ctx = { + NULL, /* pre conf */ + + NULL, /* create main configuration */ + NULL, /* init main configuration */ + + ngx_http_rewrite_create_loc_conf, /* create server configuration */ + NULL, /* merge server configuration */ + + NULL, /* create location configration */ + NULL, /* merge location configration */ +}; + + +ngx_module_t ngx_http_rewrite_module = { + NGX_MODULE, + &ngx_http_rewrite_module_ctx, /* module context */ + ngx_http_rewrite_commands, /* module directives */ + NGX_HTTP_MODULE, /* module type */ + ngx_http_rewrite_init, /* init module */ + NULL /* init child */ +}; + + +static ngx_int_t ngx_http_rewrite_handler(ngx_http_request_t *r) +{ + int *matches; + char *p; + size_t len; + uintptr_t data; + ngx_int_t rc, i, n, m; + ngx_str_t uri; + ngx_http_rewrite_op_t *op; + ngx_http_rewrite_rule_t *rule; + ngx_http_rewrite_srv_conf_t *scf; + + ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "http rewrite handler"); + + scf = ngx_http_get_module_srv_conf(r, ngx_http_rewrite_module); + + rule = scf->rules.elts; + for (i = 0; i < scf->rules.nelts; i++) { + + if (rule[i].msize) { + if (!(matches = ngx_palloc(r->pool, rule[i].msize * sizeof(int)))) { + return NGX_HTTP_INTERNAL_SERVER_ERROR; + } + + } else { + matches = NULL; + } + + rc = ngx_regex_exec(rule[i].regex, &r->uri, matches, rule[i].msize); + + if (rc == NGX_DECLINED) { + if (scf->log) { + ngx_log_error(NGX_LOG_NOTICE, r->connection->log, 0, + "\"%s\" is not matched", rule[i].re_name.data); + } + + continue; + } + + if (rc < 0) { + ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0, + ngx_regex_exec_n + " failed: %d on \"%s\" using \"%s\"", + rc, r->uri.data, rule[i].re_name.data); + return NGX_HTTP_INTERNAL_SERVER_ERROR; + } + + if (scf->log) { + ngx_log_error(NGX_LOG_NOTICE, r->connection->log, 0, + "\"%s\" matched", rule[i].re_name.data); + } + + uri.len = rule[i].size; + + for (n = 1; n < rc; n++) { + uri.len += matches[2 * n + 1] - matches[2 * n]; + } + + if (!(uri.data = ngx_palloc(r->pool, uri.len + 1))) { + return NGX_HTTP_INTERNAL_SERVER_ERROR; + } + + p = uri.data; + + op = rule[i].ops.elts; + for (n = 0; n < rule[i].ops.nelts; n++) { + if (op[n].op == NGX_HTTP_REWRITE_COPY_SHORT) { + len = op[n].len; + data = op[n].data; + while (len--) { + *p++ = data & 0xff; + data >>= 8; + } + + } else if (op[n].op == NGX_HTTP_REWRITE_COPY_LONG) { + p = ngx_cpymem(p, (void *) op[n].data, op[n].len); + + } else { /* NGX_HTTP_REWRITE_COPY_MATCH */ + m = 2 * op[n].data; + p = ngx_cpymem(p, &r->uri.data[matches[m]], + matches[m + 1] - matches[m]); + } + } + + *p = '\0'; + + if (scf->log) { + ngx_log_error(NGX_LOG_NOTICE, r->connection->log, 0, + "rewritten uri: \"%s\"", uri.data); + } + + r->uri = uri; + + if (ngx_http_set_exten(r) != NGX_OK) { + return NGX_HTTP_INTERNAL_SERVER_ERROR; + } + + if (rule[i].last) { + return NGX_DECLINED; + } + } + + return NGX_DECLINED; +} + + +static void *ngx_http_rewrite_create_loc_conf(ngx_conf_t *cf) +{ + ngx_http_rewrite_srv_conf_t *conf; + + if (!(conf = ngx_palloc(cf->pool, sizeof(ngx_http_rewrite_srv_conf_t)))) { + return NGX_CONF_ERROR; + } + + ngx_init_array(conf->rules, cf->pool, 5, sizeof(ngx_http_rewrite_rule_t), + NGX_CONF_ERROR); + + conf->log = 1; + + return conf; +} + + +static char *ngx_http_rewrite_rule(ngx_conf_t *cf, ngx_command_t *cmd, + void *conf) +{ + ngx_http_rewrite_srv_conf_t *scf = conf; + + char *data, *p; + size_t len; + ngx_str_t *value, err; + ngx_uint_t i; + ngx_http_rewrite_op_t *op; + ngx_http_rewrite_rule_t *rule; + char errstr[NGX_MAX_CONF_ERRSTR]; + + if (!(rule = ngx_push_array(&scf->rules))) { + return NGX_CONF_ERROR; + } + + ngx_init_array(rule->ops, cf->pool, 5, sizeof(ngx_http_rewrite_op_t), + NGX_CONF_ERROR); + + rule->msize = 0; + rule->size = 0; + + value = cf->args->elts; + + /* STUB */ { + err.len = NGX_MAX_CONF_ERRSTR; + err.data = errstr; + + rule->regex = ngx_regex_compile(&value[1], 0, cf->pool, &err); + + if (rule->regex == NULL) { + ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "%s", err.data); + return NGX_CONF_ERROR; + } + + rule->re_name = value[1]; + rule->s_name = value[2]; + + for (i = 0; i < value[2].len; /* void */) { + + if (!(op = ngx_push_array(&rule->ops))) { + return NGX_CONF_ERROR; + } + + data = &value[2].data[i]; + + if (value[2].data[i] == '$' + && i < value[2].len + && value[2].data[i + 1] >= '1' + && value[2].data[i + 1] <= '9') + { + op->op = NGX_HTTP_REWRITE_COPY_MATCH; + op->data = value[2].data[++i] - '0'; + + if (rule->msize < op->data) { + rule->msize = op->data; + } + + i++; + + } else { + i++; + + while (i < value[2].len && value[2].data[i] != '$') { + i++; + } + + len = &value[2].data[i] - data; + rule->size += len; + + if (len) { + + op->len = len; + + if (len <= sizeof(uintptr_t)) { + op->op = NGX_HTTP_REWRITE_COPY_SHORT; + op->data = 0; + + while (len--) { + op->data <<= 8; + op->data |= data[len]; + } + + } else { + op->op = NGX_HTTP_REWRITE_COPY_LONG; + + if (!(p = ngx_palloc(cf->pool, len))) { + return NGX_CONF_ERROR; + } + + ngx_memcpy(p, data, len); + op->data = (uintptr_t) p; + } + } + } + } + + rule->msize++; + rule->msize *= 3; + + if (cf->args->nelts > 3) { + if (ngx_strcmp(value[3].data, "last") == 0) { + rule->last = 1; + + } else { + ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, + "invalid parameter \"%s\"", value[3].data); + return NGX_CONF_ERROR; + } + } + } + + return NGX_CONF_OK; +} + + +static ngx_int_t ngx_http_rewrite_init(ngx_cycle_t *cycle) +{ + ngx_http_handler_pt *h; + ngx_http_conf_ctx_t *ctx; + ngx_http_core_main_conf_t *cmcf; + + ctx = (ngx_http_conf_ctx_t *) cycle->conf_ctx[ngx_http_module.index]; + cmcf = ctx->main_conf[ngx_http_core_module.ctx_index]; + + h = ngx_push_array(&cmcf->phases[NGX_HTTP_REWRITE_PHASE].handlers); + if (h == NULL) { + return NGX_ERROR; + } + + *h = ngx_http_rewrite_handler; + + return NGX_OK; +} |