Add API to query district by GPS location

api/api.go

@@ -78,6 +78,39 @@ func apiAudioContentPost(w http.ResponseWriter, r *http.Request, u *models.User)
 	w.WriteHeader(http.StatusOK)
 }
 
+func apiGetDistrict(w http.ResponseWriter, r *http.Request) {
+	var latStr, lngStr string
+	err := r.ParseForm()
+	if err != nil {
+		render.Render(w, r, errRender(fmt.Errorf("Failed to parse GET form: %w", err)))
+		return
+	} else {
+		latStr = r.FormValue("lat")
+		lngStr = r.FormValue("lng")
+	}
+	lat, err := strconv.ParseFloat(latStr, 64)
+	if err != nil {
+		render.Render(w, r, errRender(fmt.Errorf("Failed to parse lat as float: %w", err)))
+		return
+	}
+	lng, err := strconv.ParseFloat(lngStr, 64)
+	if err != nil {
+		render.Render(w, r, errRender(fmt.Errorf("Failed to parse lng as float: %w", err)))
+		return
+	}
+	district, err := platform.DistrictForLocation(r.Context(), lng, lat)
+	if err != nil {
+		render.Render(w, r, errRender(fmt.Errorf("Failed to get district: %w", err)))
+		return
+	}
+	d := ResponseDistrict{
+		Agency: district.Agency.GetOr(""),
+	}
+	if err := render.Render(w, r, d); err != nil {
+		render.Render(w, r, errRender(err))
+	}
+}
+
 func handleClientIos(w http.ResponseWriter, r *http.Request, u *models.User) {
 	var sinceStr string
 	err := r.ParseForm()

api/endpoint.go

@@ -20,6 +20,7 @@ func AddRoutes(r chi.Router) {
 	r.Method("POST", "/image/{uuid}/content", auth.NewEnsureAuth(apiImageContentPost))
 
 	// Unauthenticated endpoints
+	r.Get("/district", apiGetDistrict)
 	r.Get("/webhook/fieldseeker", webhookFieldseeker)
 	r.Post("/webhook/fieldseeker", webhookFieldseeker)
 }

api/types.go

@@ -62,6 +62,10 @@ type NoteAudioPayload struct {
 	Version                 int32                        `json:"version"`
 }
 
+type ResponseDistrict struct {
+	Agency string `json:"agency"`
+}
+
 type ResponseMosquitoSource struct {
 	Access                  string                       `json:"access"`
 	Active                  *bool                        `json:"active"`
@@ -154,6 +158,10 @@ func NewResponseMosquitoInspections(inspections models.FieldseekerMosquitoinspec
 	return results
 }
 
+func (rd ResponseDistrict) Render(w http.ResponseWriter, r *http.Request) error {
+	return nil
+}
+
 func (rtd ResponseMosquitoSource) Render(w http.ResponseWriter, r *http.Request) error {
 	return nil
 }