feat: add option for cors

apisix/plugins/cors.lua

@@ -64,7 +64,7 @@ local schema = {
         allow_credential = {
             type = "boolean",
             default = false
-        },
+        }
     }
 }
 
@@ -75,6 +75,7 @@ local _M = {
     schema = schema,
 }
 
+
 local function create_mutiple_origin_cache(conf)
     if not str_find(conf.allow_origins, ",", 1, true) then
         return nil
@@ -99,6 +100,7 @@ local function create_mutiple_origin_cache(conf)
     return origin_cache
 end
 
+
 function _M.check_schema(conf)
     local ok, err = core.schema.check(schema, conf)
     if not ok then
@@ -108,23 +110,32 @@ function _M.check_schema(conf)
     return true
 end
 
+
 local function set_cors_headers(conf, ctx)
     local allow_methods = conf.allow_methods
     if allow_methods == "**" then
         allow_methods = "GET,POST,PUT,DELETE,PATCH,HEAD,OPTIONS,CONNECT,TRACE"
     end
 
-    ngx.header["Access-Control-Allow-Origin"] = ctx.cors_allow_origins
-    ngx.header["Access-Control-Allow-Methods"] = allow_methods
-    ngx.header["Access-Control-Allow-Headers"] = conf.allow_headers
-    ngx.header["Access-Control-Max-Age"] = conf.max_age
+    core.response.set_header("Access-Control-Allow-Origin", ctx.cors_allow_origins)
+    core.response.set_header("Access-Control-Allow-Methods", allow_methods)
+    core.response.set_header("Access-Control-Allow-Headers", conf.allow_headers)
+    core.response.set_header("Access-Control-Max-Age", conf.max_age)
+    core.response.set_header("Access-Control-Expose-Headers", conf.expose_headers)
     if conf.allow_credential then
-        ngx.header["Access-Control-Allow-Credentials"] = true
+        core.response.set_header("Access-Control-Allow-Credentials", true)
     end
-    ngx.header["Access-Control-Expose-Headers"] = conf.expose_headers
 end
 
+
 function _M.rewrite(conf, ctx)
+    if ctx.var.request_method == "OPTIONS" then
+        return 200
+    end
+end
+
+
+function _M.header_filter(conf, ctx)
     local allow_origins = conf.allow_origins
     local req_origin = core.request.header(ctx, "Origin")
     if allow_origins == "**" then
@@ -146,10 +157,6 @@ function _M.rewrite(conf, ctx)
 
     ctx.cors_allow_origins = allow_origins
     set_cors_headers(conf, ctx)
-
-    if ctx.var.request_method == "OPTIONS" then
-        return 200
-    end
 end
 
 return _M

t/lib/server.lua

@@ -250,5 +250,14 @@ function _M.go()
     return _M[action]()
 end
 
+function _M.headers()
+    local args = ngx.req.get_uri_args()
+    for name, val in pairs(args) do
+        ngx.header[name] = nil
+        ngx.header[name] = val
+    end
+
+    ngx.say("/headers")
+end
 
 return _M

t/plugin/cors.t

@@ -491,3 +491,129 @@ Access-Control-Max-Age: 5
 Access-Control-Allow-Credentials:
 --- no_error_log
 [error]
+
+
+
+=== TEST 17: set route(overwrite upstream)
+--- config
+    location /t {
+        content_by_lua_block {
+            local t = require("lib.test_admin").test
+            local code, body = t('/apisix/admin/routes/1',
+                 ngx.HTTP_PUT,
+                 [[{
+                    "plugins": {
+                        "cors": {
+                            "allow_origins": "**",
+                            "allow_methods": "**",
+                            "allow_headers": "*",
+                            "expose_headers": "*",
+                            "allow_credential": true
+                        }
+                    },
+                    "upstream": {
+                        "nodes": {
+                            "127.0.0.1:1980": 1
+                        },
+                        "type": "roundrobin"
+                    },
+                    "uri": "/headers"
+                }]]
+                )
+
+            if code >= 300 then
+                ngx.status = code
+            end
+            ngx.say(body)
+        }
+    }
+--- request
+GET /t
+--- response_body
+passed
+--- no_error_log
+[error]
+
+
+
+=== TEST 18: overwrite upstream
+--- request
+GET /headers?Access-Control-Allow-Origin=https://sub.domain.com HTTP/1.1
+--- more_headers
+Origin: https://sub.domain.com
+--- response_body
+/headers
+--- response_headers
+Access-Control-Allow-Origin: https://sub.domain.com
+--- no_error_log
+[error]
+
+
+
+=== TEST 19: overwrite upstream(Access-Control-Allow-Methods)
+--- request
+GET /headers?Access-Control-Allow-Methods=methods HTTP/1.1
+--- more_headers
+Origin: https://sub.domain.com
+--- response_body
+/headers
+--- response_headers
+Access-Control-Allow-Methods: GET,POST,PUT,DELETE,PATCH,HEAD,OPTIONS,CONNECT,TRACE
+--- no_error_log
+[error]
+
+
+
+=== TEST 20: overwrite upstream(Access-Control-Allow-Headers)
+--- request
+GET /headers?Access-Control-Allow-Headers=a-headers HTTP/1.1
+--- more_headers
+Origin: https://sub.domain.com
+--- response_body
+/headers
+--- response_headers
+Access-Control-Allow-Headers: *
+--- no_error_log
+[error]
+
+
+
+=== TEST 21: overwrite upstream(Access-Control-Expose-Headers)
+--- request
+GET /headers?Access-Control-Expose-Headers=e-headers HTTP/1.1
+--- more_headers
+Origin: https://sub.domain.com
+--- response_body
+/headers
+--- response_headers
+Access-Control-Expose-Headers: *
+--- no_error_log
+[error]
+
+
+
+=== TEST 22: overwrite upstream(Access-Control-Max-Age)
+--- request
+GET /headers?Access-Control-Max-Age=10 HTTP/1.1
+--- more_headers
+Origin: https://sub.domain.com
+--- response_body
+/headers
+--- response_headers
+Access-Control-Max-Age: 5
+--- no_error_log
+[error]
+
+
+
+=== TEST 23: not overwrite upstream(Access-Control-Allow-Credentials)
+--- request
+GET /headers?Access-Control-Allow-Credentials=false HTTP/1.1
+--- more_headers
+Origin: https://sub.domain.com
+--- response_body
+/headers
+--- response_headers
+Access-Control-Allow-Credentials: true
+--- no_error_log
+[error]