commit 95b55bf310d8120e672b356a0b26a47edb94dfb1
Author: Egor Kovetskiy <e.kovetskiy@office.ngs.ru>
Date:   Sat Sep 19 23:51:49 2015 +0600

    basic implementation

diff --git a/main.go b/main.go
new file mode 100644
index 0000000..8c58d2c
--- /dev/null
+++ b/main.go
@@ -0,0 +1,201 @@
+package main
+
+import (
+	"fmt"
+	"io/ioutil"
+	"log"
+	"net/url"
+	"os"
+	"path/filepath"
+
+	"github.com/BurntSushi/toml"
+	"github.com/bndr/gopencils"
+	"github.com/docopt/docopt-go"
+	"github.com/russross/blackfriday"
+	"github.com/zazab/zhash"
+)
+
+const (
+	usage = `Mark
+
+You can store user credentials in configuration file, which should be located
+in ~/.config/mark with following format:
+	user = "smith"
+	password = "matrixishere"
+
+Usage:
+	mark [-u <user>] [-p <pass>] -l <link> -f <file>
+
+Options:
+	-u <user>   Use specified username for updating Confluence page, this
+					option can be specified using configuration file.
+	-p <pass>   Use specified password for updagin Confluence page, this
+					option can be specified using configuration file.
+	-l <link>   Edit specified Confluence page.
+	-f <file>   Use specified markdown file for converting to html.
+`
+)
+
+type ResponseContent struct {
+	Version struct {
+		Number int64 `json:"number"`
+	} `json:"version"`
+}
+
+func main() {
+	args, err := docopt.Parse(usage, nil, true, "mark 1.0", true, true)
+	if err != nil {
+		panic(err)
+	}
+
+	var (
+		username, _ = args["-u"].(string)
+		password, _ = args["-p"].(string)
+		targetLink  = args["-l"].(string)
+		targetFile  = args["-f"].(string)
+	)
+
+	config, err := getConfig(filepath.Join(os.Getenv("HOME"), ".config/mark"))
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	if username == "" {
+		username, err = config.GetString("username")
+		if err != nil {
+			if zhash.IsNotFound(err) {
+				log.Fatal(
+					"Confluence username should be specified using -u " +
+						"flag or be stored in configuration file",
+				)
+			}
+
+			log.Fatal("can't read username configuration variable: %s", err)
+		}
+	}
+
+	if password == "" {
+		password, err = config.GetString("password")
+		if err != nil {
+			if zhash.IsNotFound(err) {
+				log.Fatal(
+					"Confluence password should be specified using -p " +
+						"flag or be stored in configuration file",
+				)
+			}
+
+			log.Fatal("can't read password configuration variable: %s", err)
+		}
+	}
+
+	markdownData, err := ioutil.ReadFile(targetFile)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	htmlData := blackfriday.MarkdownCommon(markdownData)
+
+	url, err := url.Parse(targetLink)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	api := gopencils.Api(
+		"http://"+url.Host+"/rest/api",
+		&gopencils.BasicAuth{username, password},
+	)
+
+	pageID := url.Query().Get("pageId")
+	if pageID == "" {
+		log.Fatal("URL should contains 'pageId' parameter")
+	}
+
+	version, err := getPageVersion(api, pageID)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	err = updatePage(api, pageID, version, htmlData)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	fmt.Printf("page %s successfully updated\n", targetLink)
+}
+
+func updatePage(
+	api *gopencils.Resource, pageID string,
+	currentPageVersion int64, newContent []byte,
+) error {
+	nextPageVersion := currentPageVersion + 1
+
+	payload := map[string]interface{}{
+		"id":   pageID,
+		"type": "page",
+		"version": map[string]interface{}{
+			"number":    nextPageVersion,
+			"minorEdit": false,
+		},
+		"body": map[string]interface{}{
+			"storage": map[string]interface{}{
+				"value":          string(newContent),
+				"representation": "storage",
+			},
+		},
+	}
+
+	request, err := api.Res(
+		"content/"+pageID, &map[string]interface{}{},
+	).Put(payload)
+	if err != nil {
+		return err
+	}
+
+	if request.Raw.StatusCode != 200 {
+		return fmt.Errorf(
+			"Confluence REST API returns unexpected HTTP status: %s",
+			request.Raw.Status,
+		)
+	}
+
+	return nil
+}
+
+func getPageVersion(api *gopencils.Resource, pageID string) (int64, error) {
+	request, err := api.Res("content/"+pageID, &ResponseContent{}).Get()
+	if err != nil {
+		return 0, err
+	}
+
+	if request.Raw.StatusCode == 401 {
+		return 0, fmt.Errorf("authentification failed")
+	}
+
+	if request.Raw.StatusCode == 404 {
+		return 0, fmt.Errorf(
+			"page with id '%s' not found, Confluence REST API returns 404",
+			pageID,
+		)
+	}
+
+	if request.Raw.StatusCode != 200 {
+		return 0, fmt.Errorf(
+			"Confluence REST API returns unexpected HTTP status: %s",
+			request.Raw.Status,
+		)
+	}
+
+	response := request.Response.(*ResponseContent)
+
+	return response.Version.Number, nil
+}
+
+func getConfig(path string) (zhash.Hash, error) {
+	configData := map[string]interface{}{}
+	_, err := toml.DecodeFile(path, &configData)
+	if err != nil && !os.IsNotExist(err) {
+		return zhash.NewHash(), fmt.Errorf("can't decode toml file: %s", err)
+	}
+
+	return zhash.HashFromMap(configData), nil
+}