Enable stricter linting with golangci-lint (#316)

* update golangci-lint

* add golangci config file w/ more linters

* correct issues flagged by stricter linters

* add more generous timeout for golangci-lint

* add some style + formatting guidelines

* move timeout to config file

* go fmt

4 files changed, 19 insertions, 14 deletions

diff --git a/internal/api/client/app/appcreate.go b/internal/api/client/app/appcreate.go
index 0c9407ae1..c23a838f4 100644
--- a/internal/api/client/app/appcreate.go
+++ b/internal/api/client/app/appcreate.go
@@ -20,14 +20,22 @@ package app
 
 import (
 	"fmt"
-	"github.com/sirupsen/logrus"
 	"net/http"
 
+	"github.com/sirupsen/logrus"
+
 	"github.com/gin-gonic/gin"
 	"github.com/superseriousbusiness/gotosocial/internal/api/model"
 	"github.com/superseriousbusiness/gotosocial/internal/oauth"
 )
 
+const (
+	// permitted length for most fields
+	formFieldLen = 64
+	// redirect can be a bit bigger because we probably need to encode data in the redirect uri
+	formRedirectLen = 512
+)
+
 // AppsPOSTHandler swagger:operation POST /api/v1/apps appCreate
 //
 // Register a new application on this instance.
@@ -79,11 +87,6 @@ func (m *Module) AppsPOSTHandler(c *gin.Context) {
 		return
 	}
 
-	// permitted length for most fields
-	formFieldLen := 64
-	// redirect can be a bit bigger because we probably need to encode data in the redirect uri
-	formRedirectLen := 512
-
 	// check lengths of fields before proceeding so the user can't spam huge entries into the database
 	if len(form.ClientName) > formFieldLen {
 		c.JSON(http.StatusBadRequest, gin.H{"error": fmt.Sprintf("client_name must be less than %d bytes", formFieldLen)})
diff --git a/internal/api/client/auth/auth.go b/internal/api/client/auth/auth.go
index c183576f8..4b8b7101e 100644
--- a/internal/api/client/auth/auth.go
+++ b/internal/api/client/auth/auth.go
@@ -29,6 +29,7 @@ import (
 	"github.com/superseriousbusiness/gotosocial/internal/router"
 )
 
+/* #nosec G101 */
 const (
 	// AuthSignInPath is the API path for users to sign in through
 	AuthSignInPath = "/auth/sign_in"
diff --git a/internal/api/client/auth/callback.go b/internal/api/client/auth/callback.go
index 322ba5fc9..286bcd935 100644
--- a/internal/api/client/auth/callback.go
+++ b/internal/api/client/auth/callback.go
@@ -182,7 +182,7 @@ func (m *Module) parseUserFromClaims(ctx context.Context, claims *oidc.Claims, i
 	//
 	// note that for the first iteration, iString is still "" when the check is made, so our first choice
 	// is still the raw username with no integer stuck on the end
-	for i := 1; !found; i = i + 1 {
+	for i := 1; !found; i++ {
 		usernameAvailable, err := m.db.IsUsernameAvailable(ctx, username+iString)
 		if err != nil {
 			return nil, err
@@ -190,7 +190,7 @@ func (m *Module) parseUserFromClaims(ctx context.Context, claims *oidc.Claims, i
 		if usernameAvailable {
 			// no error so we've found a username that works
 			found = true
-			username = username + iString
+			username += iString
 			continue
 		}
 		iString = strconv.Itoa(i)
diff --git a/internal/api/client/status/status.go b/internal/api/client/status/status.go
index cf6687efb..6c7f077e1 100644
--- a/internal/api/client/status/status.go
+++ b/internal/api/client/status/status.go
@@ -19,10 +19,11 @@
 package status
 
 import (
-	"github.com/sirupsen/logrus"
 	"net/http"
 	"strings"
 
+	"github.com/sirupsen/logrus"
+
 	"github.com/gin-gonic/gin"
 	"github.com/superseriousbusiness/gotosocial/internal/api"
 	"github.com/superseriousbusiness/gotosocial/internal/config"
@@ -110,13 +111,13 @@ func (m *Module) muxHandler(c *gin.Context) {
 	logrus.Debug("entering mux handler")
 	ru := c.Request.RequestURI
 
-	switch c.Request.Method {
-	case http.MethodGet:
-		if strings.HasPrefix(ru, ContextPath) {
+	if c.Request.Method == http.MethodGet {
+		switch {
+		case strings.HasPrefix(ru, ContextPath):
 			// TODO
-		} else if strings.HasPrefix(ru, FavouritedPath) {
+		case strings.HasPrefix(ru, FavouritedPath):
 			m.StatusFavedByGETHandler(c)
-		} else {
+		default:
 			m.StatusGETHandler(c)
 		}
 	}