[GitHub] [apisix] shuaijinchao commented on a change in pull request #5964: feat(grpc-web): support gRPC-Web Proxy

[GitBox <gi...@apache.org>]

shuaijinchao commented on a change in pull request #5964:
URL: https://github.com/apache/apisix/pull/5964#discussion_r779244854



##########
File path: apisix/plugins/grpc-web.lua
##########
@@ -0,0 +1,145 @@
+--
+-- Licensed to the Apache Software Foundation (ASF) under one or more
+-- contributor license agreements.  See the NOTICE file distributed with
+-- this work for additional information regarding copyright ownership.
+-- The ASF licenses this file to You 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.
+
+local ngx = ngx
+local ngx_arg = ngx.arg
+local core = require("apisix.core")
+local req_read_body = ngx.req.read_body
+local req_set_body_data = ngx.req.set_body_data
+local req_set_uri = ngx.req.set_uri
+local decode_base64 = ngx.decode_base64
+local encode_base64 = ngx.encode_base64
+
+local ALLOW_METHOD_OPTIONS = "OPTIONS"
+local ALLOW_METHOD_POST = "POST"
+local CONTENT_ENCODING_BASE64 = "base64"
+local CONTENT_ENCODING_BINARY = "binary"
+local DEFAULT_CORS_CONTENT_TYPE = "application/grpc-web-text+proto"
+local DEFAULT_CORS_ALLOW_ORIGIN = "*"
+local DEFAULT_CORS_ALLOW_METHODS = ALLOW_METHOD_POST
+local DEFAULT_CORS_ALLOW_HEADERS = "content-type,x-grpc-web,x-user-agent"
+local DEFAULT_PROXY_CONTENT_TYPE = "application/grpc"
+
+local plugin_name = "grpc-web"
+
+local schema = {
+    type = "object",
+    properties = {},
+}
+
+local grpc_web_content_encoding = {
+    ["application/grpc-web"] = CONTENT_ENCODING_BINARY,
+    ["application/grpc-web-text"] = CONTENT_ENCODING_BASE64,
+    ["application/grpc-web+proto"] = CONTENT_ENCODING_BINARY,
+    ["application/grpc-web-text+proto"] = CONTENT_ENCODING_BASE64,
+}
+
+local _M = {
+    version = 0.1,
+    priority = 505,
+    name = plugin_name,
+    schema = schema,
+}
+
+function _M.check_schema(conf)
+    local ok, err = core.schema.check(schema, conf)
+    if not ok then
+        return false, err
+    end
+
+    return true
+end
+
+function _M.access(conf, ctx)
+    local method = core.request.get_method()
+    if method == ALLOW_METHOD_OPTIONS then
+        return 204
+    end
+
+    if method ~= ALLOW_METHOD_POST then
+        -- https://github.com/grpc/grpc-web/blob/master/doc/browser-features.md#cors-support
+        core.log.error("request method: `", method, "` invalid")
+        return 400
+    end
+
+    local mimetype = core.request.header(ctx, "Content-Type")
+    local encoding = grpc_web_content_encoding[mimetype]
+    if not encoding then
+        core.log.error("request Content-Type: `", mimetype, "` invalid")
+        return 400
+    end
+
+    -- set grpc path
+    if not (ctx.curr_req_matched and ctx.curr_req_matched[":ext"]) then
+        core.log.error("please use matching pattern for routing URI, for example: /* or /grpc/*")
+        return 400
+    end
+
+    local path = ctx.curr_req_matched[":ext"]
+    if path:byte(1) ~= core.string.byte("/") then
+        path = "/" .. path
+    end
+
+    req_set_uri(path)
+
+    -- set grpc body
+    local body, err = core.request.get_body()
+    if err then
+        core.log.error("reading body err, ", err)
+        return 400
+    end
+
+    if encoding == CONTENT_ENCODING_BASE64 then
+        body = decode_base64(body)

Review comment:
       updated




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