a bit of refactoring

auth.go

@@ -0,0 +1,106 @@
+package main
+
+import (
+	"errors"
+	"fmt"
+	"net/url"
+	"strings"
+
+	"github.com/reconquest/karma-go"
+	"github.com/zazab/zhash"
+)
+
+type Credentials struct {
+	Username string
+	Password string
+	BaseURL  string
+	PageID   string
+}
+
+func GetCredentials(
+	args map[string]interface{},
+	config zhash.Hash,
+) (*Credentials, error) {
+	var (
+		username, _  = args["-u"].(string)
+		password, _  = args["-p"].(string)
+		targetURL, _ = args["-l"].(string)
+	)
+
+	var err error
+
+	if username == "" {
+		username, err = config.GetString("username")
+		if err != nil {
+			if zhash.IsNotFound(err) {
+				return nil, errors.New(
+					"Confluence username should be specified using -u " +
+						"flag or be stored in configuration file",
+				)
+			}
+
+			return nil, fmt.Errorf(
+				"can't read username configuration variable: %s", err,
+			)
+		}
+	}
+
+	if password == "" {
+		password, err = config.GetString("password")
+		if err != nil {
+			if zhash.IsNotFound(err) {
+				return nil, errors.New(
+					"Confluence password should be specified using -p " +
+						"flag or be stored in configuration file",
+				)
+			}
+
+			return nil, fmt.Errorf(
+				"can't read password configuration variable: %s", err,
+			)
+		}
+	}
+
+	url, err := url.Parse(targetURL)
+	if err != nil {
+		return nil, karma.Format(
+			err,
+			"unable to parse %q as url", targetURL,
+		)
+	}
+
+	baseURL := url.Scheme + "://" + url.Host
+
+	if url.Host == "" {
+		var ok bool
+		baseURL, ok = args["--base-url"].(string)
+		if !ok {
+			baseURL, err = config.GetString("base_url")
+			if err != nil {
+				if zhash.IsNotFound(err) {
+					return nil, errors.New(
+						"Confluence base URL should be specified using -l " +
+							"flag or be stored in configuration file",
+					)
+				}
+
+				return nil, fmt.Errorf(
+					"can't read base_url configuration variable: %s", err,
+				)
+			}
+		}
+	}
+
+	baseURL = strings.TrimRight(baseURL, `/`)
+
+	pageID := url.Query().Get("pageId")
+
+	creds := &Credentials{
+		Username: username,
+		Password: password,
+		BaseURL:  baseURL,
+		PageID:   pageID,
+	}
+
+	return creds, nil
+}