gitsources: fix linter errors

Fix errors reported by default golangci-lint linters

internal/gitsources/agolagit/agolagit.go

@@ -16,7 +16,6 @@ package agolagit
 
 import (
 	"crypto/tls"
-	"encoding/json"
 	"fmt"
 	"io"
 	"io/ioutil"
@@ -114,18 +113,6 @@ func (c *Client) getResponse(method, path string, query url.Values, header http.
 	return resp, nil
 }
 
-func (c *Client) getParsedResponse(method, path string, query url.Values, header http.Header, ibody io.Reader, obj interface{}) (*http.Response, error) {
-	resp, err := c.getResponse(method, path, query, header, ibody)
-	if err != nil {
-		return resp, err
-	}
-	defer resp.Body.Close()
-
-	d := json.NewDecoder(resp.Body)
-
-	return resp, d.Decode(obj)
-}
-
 func (c *Client) GetUserInfo() (*gitsource.UserInfo, error) {
 	return nil, nil
 }

internal/gitsources/gitea/parse.go

@@ -60,7 +60,9 @@ func (c *Client) ParseWebhook(r *http.Request, secret string) (*types.WebhookDat
 			return nil, errors.Errorf("wrong webhook signature")
 		}
 		h := hmac.New(sha256.New, []byte(secret))
-		h.Write(data)
+		if _, err := h.Write(data); err != nil {
+			return nil, errors.Errorf("failed to calculate webhook signature")
+		}
 		cs := h.Sum(nil)
 		if !hmac.Equal(cs, ds) {
 			return nil, errors.Errorf("wrong webhook signature")

internal/gitsources/github/parse.go

@@ -28,9 +28,6 @@ import (
 )
 
 const (
-	hookPush        = "push"
-	hookPullRequest = "pull_request"
-
 	prStateOpen = "open"
 
 	prActionOpen = "opened"

internal/gitsources/gitlab/gitlab.go

@@ -90,7 +90,9 @@ func New(opts Opts) (*Client, error) {
 	}
 	httpClient := &http.Client{Transport: transport}
 	client := gitlab.NewOAuthClient(httpClient, opts.Token)
-	client.SetBaseURL(opts.APIURL)
+	if err := client.SetBaseURL(opts.APIURL); err != nil {
+		return nil, errors.Errorf("failed to set gitlab client base url: %w", err)
+	}
 
 	return &Client{
 		client:         client,
@@ -303,10 +305,6 @@ func (c *Client) GetRef(repopath, ref string) (*gitsource.Ref, error) {
 			return nil, err
 		}
 
-		if err != nil {
-			return nil, err
-		}
-
 		return &gitsource.Ref{
 			Ref:       ref,
 			CommitSHA: remoteBranch.Commit.ID,
@@ -319,10 +317,6 @@ func (c *Client) GetRef(repopath, ref string) (*gitsource.Ref, error) {
 			return nil, err
 		}
 
-		if err != nil {
-			return nil, err
-		}
-
 		return &gitsource.Ref{
 			Ref:       ref,
 			CommitSHA: remoteTag.Commit.ID,

internal/gitsources/gitlab/parse.go

@@ -35,11 +35,6 @@ const (
 	hookPush        = "Push Hook"
 	hookTagPush     = "Tag Push Hook"
 	hookPullRequest = "Merge Request Hook"
-
-	prStateOpen = "open"
-
-	prActionOpen = "opened"
-	prActionSync = "synchronized"
 )
 
 func (c *Client) ParseWebhook(r *http.Request, secret string) (*types.WebhookData, error) {