[chore] Set User-Agent header in transport (#1154)

Currently requests set their own User-Agent. This moves it down to set
it in the transport's do() method, to guarantee it's always set on all
requests.

internal/transport/deliver.go

@@ -82,7 +82,6 @@ func (t *transport) Deliver(ctx context.Context, b []byte, to *url.URL) error {
 
 	req.Header.Add("Content-Type", string(api.AppActivityLDJSON))
 	req.Header.Add("Accept-Charset", "utf-8")
-	req.Header.Add("User-Agent", t.controller.userAgent)
 	req.Header.Set("Host", to.Host)
 
 	resp, err := t.POST(req, b)

internal/transport/dereference.go

@@ -63,7 +63,6 @@ func (t *transport) Dereference(ctx context.Context, iri *url.URL) ([]byte, erro
 
 	req.Header.Add("Accept", string(api.AppActivityLDJSON)+","+string(api.AppActivityJSON))
 	req.Header.Add("Accept-Charset", "utf-8")
-	req.Header.Add("User-Agent", t.controller.userAgent)
 	req.Header.Set("Host", iri.Host)
 
 	// Perform the HTTP request

internal/transport/derefinstance.go

@@ -93,7 +93,6 @@ func dereferenceByAPIV1Instance(ctx context.Context, t *transport, iri *url.URL)
 	}
 
 	req.Header.Add("Accept", string(api.AppJSON))
-	req.Header.Add("User-Agent", t.controller.userAgent)
 	req.Header.Set("Host", cleanIRI.Host)
 
 	resp, err := t.GET(req)
@@ -244,7 +243,6 @@ func callNodeInfoWellKnown(ctx context.Context, t *transport, iri *url.URL) (*ur
 		return nil, err
 	}
 	req.Header.Add("Accept", string(api.AppJSON))
-	req.Header.Add("User-Agent", t.controller.userAgent)
 	req.Header.Set("Host", cleanIRI.Host)
 
 	resp, err := t.GET(req)
@@ -296,7 +294,6 @@ func callNodeInfo(ctx context.Context, t *transport, iri *url.URL) (*apimodel.No
 		return nil, err
 	}
 	req.Header.Add("Accept", string(api.AppJSON))
-	req.Header.Add("User-Agent", t.controller.userAgent)
 	req.Header.Set("Host", iri.Host)
 
 	resp, err := t.GET(req)

internal/transport/derefmedia.go

@@ -36,7 +36,6 @@ func (t *transport) DereferenceMedia(ctx context.Context, iri *url.URL) (io.Read
 		return nil, 0, err
 	}
 	req.Header.Add("Accept", "*/*") // we don't know what kind of media we're going to get here
-	req.Header.Add("User-Agent", t.controller.userAgent)
 	req.Header.Set("Host", iri.Host)
 
 	// Perform the HTTP request

internal/transport/finger.go

@@ -41,7 +41,6 @@ func (t *transport) Finger(ctx context.Context, targetUsername string, targetDom
 	}
 	req.Header.Add("Accept", string(api.AppJSON))
 	req.Header.Add("Accept", "application/jrd+json")
-	req.Header.Add("User-Agent", t.controller.userAgent)
 	req.Header.Set("Host", req.URL.Host)
 
 	// Perform the HTTP request

internal/transport/transport.go

@@ -134,6 +134,8 @@ func (t *transport) do(r *http.Request, signer func(*http.Request) error, retryO
 		{"url", r.URL.String()},
 	}...)
 
+	r.Header.Set("User-Agent", t.controller.userAgent)
+
 	for i := 0; i < maxRetries; i++ {
 		// Reset signing header fields
 		now := t.controller.clock.Now().UTC()