Add `Accept` header negotiation to relevant API endpoints (#337)

* start centralizing negotiation logic for API

* swagger document nodeinfo endpoint

* go fmt

* document negotiate function

* use content negotiation

* tidy up negotiation logic

* negotiate content throughout client api

* swagger

* remove attachment on Content

* add accept header to test requests

4 files changed, 23 insertions, 2 deletions

diff --git a/internal/api/client/followrequest/authorize.go b/internal/api/client/followrequest/authorize.go
index 1ab7891a6..1e1a46711 100644
--- a/internal/api/client/followrequest/authorize.go
+++ b/internal/api/client/followrequest/authorize.go
@@ -19,10 +19,12 @@
 package followrequest
 
 import (
-	"github.com/sirupsen/logrus"
 	"net/http"
 
+	"github.com/sirupsen/logrus"
+
 	"github.com/gin-gonic/gin"
+	"github.com/superseriousbusiness/gotosocial/internal/api"
 	"github.com/superseriousbusiness/gotosocial/internal/oauth"
 )
 
@@ -76,6 +78,11 @@ func (m *Module) FollowRequestAuthorizePOSTHandler(c *gin.Context) {
 		return
 	}
 
+	if _, err := api.NegotiateAccept(c, api.JSONAcceptHeaders...); err != nil {
+		c.JSON(http.StatusNotAcceptable, gin.H{"error": err.Error()})
+		return
+	}
+
 	if authed.User.Disabled || !authed.User.Approved || !authed.Account.SuspendedAt.IsZero() {
 		l.Debugf("couldn't auth: %s", err)
 		c.JSON(http.StatusForbidden, gin.H{"error": "account is disabled, not yet approved, or suspended"})
diff --git a/internal/api/client/followrequest/followrequest_test.go b/internal/api/client/followrequest/followrequest_test.go
index e7dccc210..27b8d3db2 100644
--- a/internal/api/client/followrequest/followrequest_test.go
+++ b/internal/api/client/followrequest/followrequest_test.go
@@ -106,6 +106,7 @@ func (suite *FollowRequestStandardTestSuite) newContext(recorder *httptest.Respo
 	if bodyContentType != "" {
 		ctx.Request.Header.Set("Content-Type", bodyContentType)
 	}
+	ctx.Request.Header.Set("accept", "application/json")
 
 	return ctx
 }
diff --git a/internal/api/client/followrequest/get.go b/internal/api/client/followrequest/get.go
index de8c83d9a..036e51c8d 100644
--- a/internal/api/client/followrequest/get.go
+++ b/internal/api/client/followrequest/get.go
@@ -19,10 +19,12 @@
 package followrequest
 
 import (
-	"github.com/sirupsen/logrus"
 	"net/http"
 
+	"github.com/sirupsen/logrus"
+
 	"github.com/gin-gonic/gin"
+	"github.com/superseriousbusiness/gotosocial/internal/api"
 	"github.com/superseriousbusiness/gotosocial/internal/oauth"
 )
 
@@ -83,6 +85,11 @@ func (m *Module) FollowRequestGETHandler(c *gin.Context) {
 		return
 	}
 
+	if _, err := api.NegotiateAccept(c, api.JSONAcceptHeaders...); err != nil {
+		c.JSON(http.StatusNotAcceptable, gin.H{"error": err.Error()})
+		return
+	}
+
 	if authed.User.Disabled || !authed.User.Approved || !authed.Account.SuspendedAt.IsZero() {
 		l.Debugf("couldn't auth: %s", err)
 		c.JSON(http.StatusForbidden, gin.H{"error": "account is disabled, not yet approved, or suspended"})
diff --git a/internal/api/client/followrequest/reject.go b/internal/api/client/followrequest/reject.go
index a7fa12e7f..28459b9a6 100644
--- a/internal/api/client/followrequest/reject.go
+++ b/internal/api/client/followrequest/reject.go
@@ -23,6 +23,7 @@ import (
 
 	"github.com/gin-gonic/gin"
 	"github.com/sirupsen/logrus"
+	"github.com/superseriousbusiness/gotosocial/internal/api"
 	"github.com/superseriousbusiness/gotosocial/internal/oauth"
 )
 
@@ -74,6 +75,11 @@ func (m *Module) FollowRequestRejectPOSTHandler(c *gin.Context) {
 		return
 	}
 
+	if _, err := api.NegotiateAccept(c, api.JSONAcceptHeaders...); err != nil {
+		c.JSON(http.StatusNotAcceptable, gin.H{"error": err.Error()})
+		return
+	}
+
 	if authed.User.Disabled || !authed.User.Approved || !authed.Account.SuspendedAt.IsZero() {
 		l.Debugf("couldn't auth: %s", err)
 		c.JSON(http.StatusForbidden, gin.H{"error": "account is disabled, not yet approved, or suspended"})