Serve `outbox` for Actor (#289)

* add statusesvisible convenience function

* add minID + onlyPublic to account statuses get

* move swagger collection stuff to common

* start working on Outbox GETting

* move functions into federationProcessor

* outboxToASCollection

* add statusesvisible convenience function

* add minID + onlyPublic to account statuses get

* move swagger collection stuff to common

* start working on Outbox GETting

* move functions into federationProcessor

* outboxToASCollection

* bit more work on outbox paging

* wrapNoteInCreate function

* test + hook up the processor functions

* don't do prev + next links on empty reply

* test get outbox through api

* don't fail on no status entries

* add outbox implementation doc

* typo

1 files changed, 142 insertions, 0 deletions

diff --git a/internal/api/s2s/user/outboxget.go b/internal/api/s2s/user/outboxget.go
new file mode 100644
index 000000000..46f9d2ded
--- /dev/null
+++ b/internal/api/s2s/user/outboxget.go
@@ -0,0 +1,142 @@
+/*
+   GoToSocial
+   Copyright (C) 2021 GoToSocial Authors admin@gotosocial.org
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Affero General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Affero General Public License for more details.
+
+   You should have received a copy of the GNU Affero General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package user
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"strconv"
+
+	"github.com/gin-gonic/gin"
+	"github.com/sirupsen/logrus"
+)
+
+// OutboxGETHandler swagger:operation GET /users/{username}/outbox s2sOutboxGet
+//
+// Get the public outbox collection for an actor.
+//
+// Note that the response will be a Collection with a page as `first`, as shown below, if `page` is `false`.
+//
+// If `page` is `true`, then the response will be a single `CollectionPage` without the wrapping `Collection`.
+//
+// HTTP signature is required on the request.
+//
+// ---
+// tags:
+// - s2s/federation
+//
+// produces:
+// - application/activity+json
+//
+// parameters:
+// - name: username
+//   type: string
+//   description: Username of the account.
+//   in: path
+//   required: true
+// - name: page
+//   type: boolean
+//   description: Return response as a CollectionPage.
+//   in: query
+//   default: false
+// - name: min_id
+//   type: string
+//   description: Minimum ID of the next status, used for paging.
+//   in: query
+// - name: max_id
+//   type: string
+//   description: Maximum ID of the next status, used for paging.
+//   in: query
+//
+// responses:
+//   '200':
+//      in: body
+//      schema:
+//        "$ref": "#/definitions/swaggerCollection"
+//   '400':
+//      description: bad request
+//   '401':
+//      description: unauthorized
+//   '403':
+//      description: forbidden
+//   '404':
+//      description: not found
+func (m *Module) OutboxGETHandler(c *gin.Context) {
+	l := logrus.WithFields(logrus.Fields{
+		"func": "OutboxGETHandler",
+		"url":  c.Request.RequestURI,
+	})
+
+	requestedUsername := c.Param(UsernameKey)
+	if requestedUsername == "" {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "no username specified in request"})
+		return
+	}
+
+	page := false
+	pageString := c.Query(PageKey)
+	if pageString != "" {
+		i, err := strconv.ParseBool(pageString)
+		if err != nil {
+			l.Debugf("error parsing page string: %s", err)
+			c.JSON(http.StatusBadRequest, gin.H{"error": "couldn't parse page query param"})
+			return
+		}
+		page = i
+	}
+
+	minID := ""
+	minIDString := c.Query(MinIDKey)
+	if minIDString != "" {
+		minID = minIDString
+	}
+
+	maxID := ""
+	maxIDString := c.Query(MaxIDKey)
+	if maxIDString != "" {
+		maxID = maxIDString
+	}
+
+	format, err := negotiateFormat(c)
+	if err != nil {
+		c.JSON(http.StatusNotAcceptable, gin.H{"error": fmt.Sprintf("could not negotiate format with given Accept header(s): %s", err)})
+		return
+	}
+	l.Tracef("negotiated format: %s", format)
+
+	ctx := transferContext(c)
+
+	outbox, errWithCode := m.processor.GetFediOutbox(ctx, requestedUsername, page, maxID, minID, c.Request.URL)
+	if errWithCode != nil {
+		l.Info(errWithCode.Error())
+		c.JSON(errWithCode.Code(), gin.H{"error": errWithCode.Safe()})
+		return
+	}
+
+	b, mErr := json.Marshal(outbox)
+	if mErr != nil {
+		err := fmt.Errorf("could not marshal json: %s", mErr)
+		l.Error(err)
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+
+	c.Data(http.StatusOK, format, b)
+}