dia_entity_like.go 4.06 KB
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package federation
//
// GangGo Federation Library
// Copyright (C) 2017-2018 Lukas Matt <lukas@zauberstuhl.de>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.
//

import (
  "net/http"
  "bytes"
  "crypto/rsa"
  "github.com/Zauberstuhl/go-xml"
  helpers "git.feneas.org/ganggo/federation/helpers"
)

type DiasporaLike struct {
  XMLName xml.Name `xml:"like"`
  EntityPositive bool `xml:"positive"`
  EntityGuid string `xml:"guid"`
  EntityParentGuid string `xml:"parent_guid"`
  EntityParentType string `xml:"parent_type"`
  EntityAuthor string `xml:"author"`
  EntityAuthorSignature string `xml:"author_signature"`

  // store relayable signature order
  EntitySignatureOrder string `xml:"-"`
  // store original entity in case we relay it
  EntityRaw []byte `xml:"-"`
}

func (e *DiasporaLike) Author() string {
  return e.EntityAuthor
}

func (e *DiasporaLike) SetAuthor(author string) {
  (*e).EntityAuthor = author
}

func (e *DiasporaLike) Send(inbox string, priv *rsa.PrivateKey, pub *rsa.PublicKey) error {
  public := len(inbox) > 6 && inbox[len(inbox)-6:] == "public"
  if public {
    pub = nil
  }

  payload, err := e.Marshal(priv, pub)
  if err != nil {
    return err
  }

  client := HttpClient{}
  if public {
    return client.Push(inbox, http.Header{
        "Content-Type": []string{CONTENT_TYPE_ENVELOPE},
      }, bytes.NewBuffer(payload))
  }
  return client.Push(inbox, http.Header{
      "Content-Type": []string{CONTENT_TYPE_JSON},
    }, bytes.NewBuffer(payload))
}

func (e *DiasporaLike) Marshal(priv *rsa.PrivateKey, pub *rsa.PublicKey) (payload []byte, err error) {
  if len(e.EntityRaw) > 0 {
    // that is a relay do not marshal
    // and use the old payload
    payload = e.EntityRaw
  } else {
    payload, err = xml.MarshalIndent(e, "", "  ")
    if err != nil {
      return
    }
    payload, err = DiasporaSortByOrder(e.EntitySignatureOrder, payload)
    if err != nil {
      return
    }
  }

  if pub != nil {
    return DiasporaEncryptedMagicEnvelope(priv, pub, e.Author(), payload)
  }
  return DiasporaMagicEnvelope(priv, e.Author(), payload)
}

func (e *DiasporaLike) Unmarshal(b []byte) error {
  return xml.Unmarshal(b, &e)
}

func (e *DiasporaLike) Type() MessageType {
  return MessageType{
    Proto: DiasporaProtocol,
    Entity: Like,
  }
}

func (e *DiasporaLike) Guid() string {
  return e.EntityGuid
}

func (e *DiasporaLike) SetGuid(guid string) {
  (*e).EntityGuid = guid
}

func (e *DiasporaLike) Parent() string {
  return e.EntityParentGuid
}

func (e *DiasporaLike) SetParent(guid string) {
  (*e).EntityParentGuid = guid
  // XXX see models.ShareablePost depending on AP
  // implementation we should change this
  (*e).EntityParentType = "Post"
}

func (e *DiasporaLike) Signature() string {
  return e.EntityAuthorSignature
}

func (e *DiasporaLike) SetSignature(priv *rsa.PrivateKey) error {
  signature := (&signature{}).New(e.signatureText(""), SignatureAuthorDelimiter)
  return signature.Sign(priv, &e.EntityAuthorSignature)
}

func (e *DiasporaLike) SignatureOrder() string {
  return e.EntitySignatureOrder
}

func (e *DiasporaLike) signatureText(order string) []string {
  if order != "" {
    return helpers.ExractSignatureText(order, e)
  }

  positive := "false"
  if e.EntityPositive {
    positive = "true"
  }
  return []string{
    positive,
    e.EntityGuid,
    e.EntityParentGuid,
    e.EntityParentType,
    e.EntityAuthor,
  }
}

func (e *DiasporaLike) Positive() bool {
  return e.EntityPositive
}

func (e *DiasporaLike) SetPositive(positive bool) {
  (*e).EntityPositive = positive
}