initial

LICENSE

@@ -0,0 +1,202 @@
+
+                                 Apache License
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+   Copyright 2019 Darko Luketic
+
+   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.

README.md

@@ -0,0 +1,42 @@
+# chromedom
+
+a simple proxy for rendering SPA
+
+WIP
+
+### configure nginx
+
+see also https://gist.github.com/thoop/8165802
+
+```
+	location / {
+        try_files $uri @prerender;
+    }
+
+	location @prerender {
+        proxy_set_header Host $host;
+        set $prerender 0;
+        if ($http_user_agent ~* "googlebot|bingbot|yandex|baiduspider|twitterbot|facebookexternalhit|rogerbot|linkedinbot|embedly|quora link preview|showyoubot|outbrain|pinterest\/0\.|pinterestbot|slackbot|vkShare|W3C_Validator|whatsapp|$
+            set $prerender 1;
+        }
+        if ($args ~ "_escaped_fragment_") {
+            set $prerender 1;
+        }
+        if ($http_user_agent ~ "Prerender") {
+            set $prerender 0;
+        }
+        if ($uri ~* "\.(js|css|xml|less|png|jpg|jpeg|gif|pdf|doc|txt|ico|rss|zip|mp3|rar|exe|wmv|doc|avi|ppt|mpg|mpeg|tif|wav|mov|psd|ai|xls|mp4|m4a|swf|dat|dmg|iso|flv|m4v|torrent|ttf|woff|svg|eot)") {
+            set $prerender 0;
+        }
+        if ($prerender = 1) {
+            proxy_pass http://127.0.0.1:9292;
+        }
+        if ($prerender = 0) {
+            rewrite .* /index.html break;
+        }
+	}
+```
+
+### TODO:
+
+- cache for already fetched sites

cmd/root.go

@@ -0,0 +1,91 @@
+/*
+Copyright © 2019 Darko Luketic <info@icod.de>
+
+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.
+*/
+package cmd
+
+import (
+	"fmt"
+	"github.com/spf13/cobra"
+	"os"
+
+	homedir "github.com/mitchellh/go-homedir"
+	"github.com/spf13/viper"
+)
+
+var cfgFile string
+
+// rootCmd represents the base command when called without any subcommands
+var rootCmd = &cobra.Command{
+	Use:   "chromedom",
+	Short: "A brief description of your application",
+	Long: `A longer description that spans multiple lines and likely contains
+examples and usage of using your application. For example:
+
+Cobra is a CLI library for Go that empowers applications.
+This application is a tool to generate the needed files
+to quickly create a Cobra application.`,
+	// Uncomment the following line if your bare application
+	// has an action associated with it:
+	//	Run: func(cmd *cobra.Command, args []string) { },
+}
+
+// Execute adds all child commands to the root command and sets flags appropriately.
+// This is called by main.main(). It only needs to happen once to the rootCmd.
+func Execute() {
+	if err := rootCmd.Execute(); err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+}
+
+func init() {
+	cobra.OnInitialize(initConfig)
+
+	// Here you will define your flags and configuration settings.
+	// Cobra supports persistent flags, which, if defined here,
+	// will be global for your application.
+
+	rootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file (default is $HOME/.chromedom.yaml)")
+
+	// Cobra also supports local flags, which will only run
+	// when this action is called directly.
+	rootCmd.Flags().BoolP("toggle", "t", false, "Help message for toggle")
+}
+
+// initConfig reads in config file and ENV variables if set.
+func initConfig() {
+	if cfgFile != "" {
+		// Use config file from the flag.
+		viper.SetConfigFile(cfgFile)
+	} else {
+		// Find home directory.
+		home, err := homedir.Dir()
+		if err != nil {
+			fmt.Println(err)
+			os.Exit(1)
+		}
+
+		// Search config in home directory with name ".chromedom" (without extension).
+		viper.AddConfigPath(home)
+		viper.SetConfigName(".chromedom")
+	}
+
+	viper.AutomaticEnv() // read in environment variables that match
+
+	// If a config file is found, read it in.
+	if err := viper.ReadInConfig(); err == nil {
+		fmt.Println("Using config file:", viper.ConfigFileUsed())
+	}
+}

cmd/serve.go

@@ -0,0 +1,68 @@
+/*
+Copyright © 2019 Darko Luketic <info@icod.de>
+
+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.
+*/
+package cmd
+
+import (
+	"fmt"
+	"github.com/dalu/chromedom/server"
+	"github.com/spf13/cobra"
+	"net"
+	"net/http"
+	"os"
+)
+
+// serveCmd represents the serve command
+var serveCmd = &cobra.Command{
+	Use:   "serve",
+	Short: "",
+	Long:  ``,
+	RunE: func(cmd *cobra.Command, args []string) error {
+		binary := cmd.Flag("binary").Value.String()
+		s := http.DefaultServeMux
+		h := server.NewHandler(binary)
+		s.Handle("/", h)
+		return http.ListenAndServe(":9292", s)
+		// return RunUnix("/tmp/chromedom.sock", s)
+	},
+}
+
+func RunUnix(file string, engine *http.ServeMux) (err error) {
+	fmt.Printf("Listening and serving HTTP on unix:/%s", file)
+	os.Remove(file)
+	listener, err := net.Listen("unix", file)
+	if err != nil {
+		return
+	}
+	defer listener.Close()
+	os.Chmod(file, 0777)
+	err = http.Serve(listener, engine)
+	return
+}
+
+func init() {
+	rootCmd.AddCommand(serveCmd)
+
+	// Here you will define your flags and configuration settings.
+
+	// Cobra supports Persistent Flags which will work for this command
+	// and all subcommands, e.g.:
+	// serveCmd.PersistentFlags().String("foo", "", "A help for foo")
+
+	// Cobra supports local flags which will only run when this command
+	// is called directly, e.g.:
+	// serveCmd.Flags().BoolP("toggle", "t", false, "Help message for toggle")
+	serveCmd.Flags().String("binary", "/bin/chromium", "chrome, chromium or headless binary path")
+}

go.mod

@@ -0,0 +1,10 @@
+module github.com/dalu/chromedom
+
+go 1.13
+
+require (
+	github.com/gin-gonic/gin v1.4.0
+	github.com/mitchellh/go-homedir v1.1.0
+	github.com/spf13/cobra v0.0.5
+	github.com/spf13/viper v1.4.0
+)

main.go

@@ -0,0 +1,22 @@
+/*
+Copyright © 2019 Darko Luketic <info@icod.de>
+
+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.
+*/
+package main
+
+import "github.com/dalu/chromedom/cmd"
+
+func main() {
+	cmd.Execute()
+}

server/handler.go

@@ -0,0 +1,77 @@
+/*
+Copyright © 2019 Darko Luketic <info@icod.de>
+
+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.
+*/
+package server
+
+import (
+	"bytes"
+	"fmt"
+	"net/http"
+	"os/exec"
+)
+
+type Handler struct {
+	binary string
+}
+
+func NewHandler(binary string) *Handler {
+	h := new(Handler)
+	h.binary = binary
+	return h
+}
+
+func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	b, e := h.FetchDom(fmt.Sprintf("https://%s%s", r.Host, r.RequestURI))
+	if e != nil {
+		fmt.Fprintln(w, e.Error())
+		return
+	}
+	w.Write(b.Bytes())
+}
+
+func (h *Handler) FetchDom(url string) (*bytes.Buffer, error) {
+	params := []string{
+		"--disable-client-side-phishing-detection",
+		"--disable-cloud-import",
+		"--disable-default-apps",
+		"--disable-dinosaur-easter-egg",
+		"--disable-new-tab-first-run",
+		"--disable-offer-upload-credit-cards",
+		"--disable-signin-promo",
+		"--disable-sync",
+		"--disable-translate",
+		"--hide-scrollbars",
+		"--incognito",
+		"--mute-audio",
+		"--no-default-browser-check",
+		"--no-first-run",
+		"--noerrdialogs",
+		"--password-store=basic",
+		"--window-size=1280,1696",
+		"--headless",
+		"--disable-gpu",
+		"--disable-software-rasterizer",
+		"--no-sandbox",
+		"--dump-dom",
+		url,
+	}
+	cmd := exec.Command(h.binary, params...)
+	buf := bytes.NewBuffer(nil)
+	cmd.Stdout = buf
+	if e := cmd.Run(); e != nil {
+		return nil, e
+	}
+	return buf, nil
+}