add config support

.flake8

@@ -0,0 +1,7 @@
+[flake8]
+extend-ignore = E203, E266, E501
+# line length is intentionally set to 80 here because black uses Bugbear
+# See https://github.com/psf/black/blob/master/docs/the_black_code_style.md#line-length for more details
+max-line-length = 80
+max-complexity = 18
+select = B,C,E,F,W,T4,B9

.gitignore

@@ -16,3 +16,4 @@
 dist
 .idea
 .env
+.vscode/settings.json

.goreleaser.yml

@@ -12,7 +12,7 @@ builds:
       - windows
     goarch:
       - amd64
-    main: ./cmd/trumpet/main.go
+    main: ./main.go
 
 archives:
   - format_overrides:

.vscode/launch.json

@@ -17,9 +17,9 @@
             "type": "go",
             "request": "launch",
             "mode": "auto",
-            "program": "${workspaceFolder}/cmd/trumpet/main.go",
+            "program": "${workspaceFolder}/main.go",
             "env": {},
-            "args": [],
+            "args": ["--logLevel", "debug", "serve"],
             "output": "${workspaceFolder}/dist/trumpet"
         }
     ]

Dockerfile

@@ -1,3 +1,7 @@
 FROM alpine
-ENTRYPOINT ["/bin/trumpet"]
-COPY trumpet /bin/trumpet
+ENV GIN_MODE=release
+RUN mkdir /app
+WORKDIR /app
+ENTRYPOINT [ "/app/trumpet" ]
+CMD [ "serve" ]
+COPY trumpet /app/trumpet

LICENSE

@@ -1,6 +1,6 @@
-MIT License
+The MIT License (MIT)
 
-Copyright (c) 2020 elonzh
+Copyright © 2020 elonzh
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
@@ -9,13 +9,13 @@ to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 copies of the Software, and to permit persons to whom the Software is
 furnished to do so, subject to the following conditions:
 
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
 
 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

cmd/config.go

@@ -0,0 +1,91 @@
+/*
+Copyright © 2020 elonzh <[email protected]>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+*/
+package cmd
+
+import (
+	"github.com/elonzh/trumpet/transformers"
+	"github.com/sirupsen/logrus"
+	"github.com/spf13/cobra"
+)
+
+// configCmd represents the config command
+var configCmd = &cobra.Command{
+	Use:   "config",
+	Short: "",
+	Long:  ``,
+}
+
+type Config struct {
+	LogLevel     logrus.Level
+	Transformers map[string]*transformers.Transformer
+}
+
+var (
+	cfg = &Config{
+		LogLevel:     logrus.InfoLevel,
+		Transformers: map[string]*transformers.Transformer{},
+	}
+)
+
+func registerTransformers(m map[string]string) {
+	for name, src := range m {
+		t, err := transformers.NewTransformer(name, src)
+		if err != nil {
+			logrus.WithError(err).WithField("Name", name).Fatalln("error when init Transformer")
+		}
+		if _, exists := cfg.Transformers[t.Name]; exists {
+			logrus.WithField("Name", name).Warnln("Transformer already exists")
+		}
+		cfg.Transformers[t.Name] = t
+	}
+}
+
+func init() {
+	builtinTransformers := map[string]string{
+		"feishu-to-dingtalk": `
+def transform(raw):
+	origin_body = json.decode(raw)
+	msg_type = origin_body['msg_type']
+	body = {}
+	if msg_type == "text":
+		body = {"msgtype": "text", "text": {"content": origin_body["content"]["text"]}}
+	return json.encode(body)
+`,
+		"dingtalk-to-feishu": `
+def transform(raw):
+	origin_body = json.decode(raw)
+	msg_type = origin_body['msgtype']
+	body = {}
+	if msg_type == "text":
+		body = {"msg_type": "text", "content": {"text": origin_body["text"]["content"]}}
+	elif msg_type == "markdown":
+		title = origin_body["markdown"].get("title")
+		text = origin_body["markdown"].get("text", "")
+		if title:
+			text = title + "\n" + text
+		body = {"msg_type": "text", "content": {"text": text}}
+	return json.encode(body)
+`,
+	}
+	registerTransformers(builtinTransformers)
+	rootCmd.AddCommand(configCmd)
+}

cmd/root.go

@@ -0,0 +1,79 @@
+/*
+Copyright © 2020 elonzh
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+*/
+package cmd
+
+import (
+	"os"
+
+	"github.com/sirupsen/logrus"
+	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
+)
+
+var cfgFile string
+
+var rootCmd = &cobra.Command{
+	Use:   "trumpet",
+	Short: "🎺simple webhook transform server",
+	Long:  ``,
+}
+
+func Execute() {
+	if err := rootCmd.Execute(); err != nil {
+		logrus.WithError(err).Fatalln()
+	}
+}
+
+func init() {
+	cobra.OnInitialize(initConfig)
+
+	rootCmd.PersistentFlags().StringVarP(&cfgFile, "config", "c", "", "config file (default is ./config.yaml)")
+	rootCmd.PersistentFlags().String("logLevel", "info", "")
+	err := viper.BindPFlag("logLevel", rootCmd.PersistentFlags().Lookup("logLevel"))
+	if err != nil {
+		panic(err)
+	}
+}
+
+func initConfig() {
+	if cfgFile != "" {
+		viper.SetConfigFile(cfgFile)
+	} else {
+		viper.AddConfigPath(".")
+		viper.SetConfigName("config")
+	}
+	var err error
+	if err = viper.ReadInConfig(); os.IsNotExist(err) {
+		logrus.WithError(err).Fatalln()
+	}
+	logrus.WithField("ConfigFile", viper.ConfigFileUsed()).Infoln("read in config")
+	cfg.LogLevel, err = logrus.ParseLevel(viper.GetString("logLevel"))
+	if err != nil {
+		logrus.WithError(err).Fatalln()
+	}
+	logrus.SetLevel(cfg.LogLevel)
+	if cfg.LogLevel >= logrus.DebugLevel {
+		logrus.WithField("Config", cfg).Debug()
+	}
+	logrus.SetFormatter(&logrus.TextFormatter{})
+	registerTransformers(viper.GetStringMapString("transformers"))
+}

cmd/serve.go

@@ -0,0 +1,81 @@
+package cmd
+
+import (
+	"fmt"
+	"io/ioutil"
+	"net/http"
+	"net/http/httputil"
+	"net/url"
+	"strings"
+
+	"github.com/gin-gonic/gin"
+	"github.com/sirupsen/logrus"
+	"github.com/spf13/cobra"
+)
+
+var serveCmd = &cobra.Command{
+	Use:   "serve",
+	Short: "",
+	Long:  ``,
+	RunE: func(cmd *cobra.Command, args []string) error {
+		r := gin.Default()
+		r.POST("/transformers/:transformer", func(c *gin.Context) {
+			transformerName := c.Param("transformer")
+			trumpetTo, err := url.Parse(c.Query("trumpet_to"))
+			if err != nil {
+				c.String(http.StatusBadRequest, err.Error())
+				return
+			}
+			transformer, ok := cfg.Transformers[transformerName]
+			if !ok {
+				c.String(http.StatusNotFound, "no such transformer `%s`", transformer)
+				return
+			}
+			raw, err := ioutil.ReadAll(c.Request.Body)
+			if err != nil {
+				c.String(http.StatusBadRequest, err.Error())
+				return
+			}
+			rawBody, err := transformer.Exec(string(raw))
+			if err != nil {
+				c.String(http.StatusInternalServerError, "error when transform data: %s", err)
+				return
+			}
+			proxy := httputil.ReverseProxy{
+				Director: func(request *http.Request) {
+					request.Host = trumpetTo.Host
+					request.URL = trumpetTo
+					request.RequestURI = ""
+					request.Header["X-Forwarded-For"] = nil
+					request.ContentLength = -1
+					delete(request.Header, "Content-Length")
+
+					request.Body = ioutil.NopCloser(strings.NewReader(rawBody))
+					if cfg.LogLevel >= logrus.DebugLevel {
+						req, err := httputil.DumpRequest(request, true)
+						fmt.Printf(
+							"\n-------------------- Request --------------------\n%s\nDumpRequestError:%s\n",
+							req, err,
+						)
+					}
+				},
+				ModifyResponse: func(response *http.Response) error {
+					if cfg.LogLevel >= logrus.DebugLevel {
+						resp, err := httputil.DumpResponse(response, true)
+						fmt.Printf(
+							"\n-------------------- Request --------------------\n%s\nDumpResponseError:%s\n",
+							resp, err,
+						)
+					}
+					return nil
+				},
+			}
+			proxy.ServeHTTP(c.Writer, c.Request)
+		})
+		return r.Run()
+	},
+}
+
+func init() {
+	rootCmd.AddCommand(serveCmd)
+}