func (this *ApiMgr) addWriter(w http.ResponseWriter, req *http.Request) {
vars := mux.Vars(req)
cid := vars["cid"]
var keystr string
if !this.decodeJsonBody(w, req, &keystr) {
return
}
var pubkey *crypto.PublicIdentity
err := transfer.DecodeString(keystr, &pubkey)
if err != nil {
this.sendError(w, http.StatusBadRequest, "Invalid public key")
return
}
owner := this.GetOwner(cid)
if owner == nil {
this.sendError(w, http.StatusNotFound, "Collection invalid")
return
}
if owner.Fingerprint().String() != this.Ident.Public().Fingerprint().String() {
this.sendError(w, http.StatusUnauthorized, "You are not the owner of the collection")
return
}
this.AddWriter(cid, this.Ident, pubkey)
this.sendJson(w, "/collections/"+cid+"/writers/"+pubkey.Fingerprint().String())
}
// Adds/Removes a writer. If a writer is removed, records from that writer may be out of sync
func (this *MetaMgr) AddWriter(cid string, owner *crypto.SecretIdentity, writer *crypto.PublicIdentity) {
// Setup some variables
key := writer.Fingerprint().String()
priority := 0 // Default priority is 0, otherwise, current + 1
newValue := transfer.AsBytes(writer)
// Check current writer state
rec := this.SyncMgr.Get(sync.RTWriter, cid, key)
if rec != nil {
// If no change, leave alone
if bytes.Equal(rec.Value, newValue) {
return
}
// Otherwise, override old priority
priority = rec.Priority + 1
}
// Add the record
wrr := &sync.Record{
RecordType: sync.RTWriter,
Topic: cid,
Key: key,
Priority: priority,
Value: newValue,
}
signRecord(wrr, owner)
this.SyncMgr.Put(wrr)
}
func verifyRecord(rec *sync.Record, writer *crypto.PublicIdentity) bool {
hash := crypto.HashOf(rec.RecordType, rec.Topic, rec.Key, rec.Value, rec.Priority)
var sig *crypto.Signature
err := transfer.DecodeBytes(rec.Signature, &sig)
if err != nil {
panic(err)
}
return writer.Verify(hash, sig)
}
func (this *MetaMgr) onWriter(who int, remote *crypto.Digest, rec *sync.Record) {
this.Log.Printf("Processing Writer")
// Verify the basis
basisRec := this.SyncMgr.Get(sync.RTBasis, rec.Topic, "$")
owner := this.decodeBasis(basisRec, false)
if owner == nil {
this.Log.Printf("Getting record before basis, ignoring")
return
}
// Validate the incoming writer record is valid
var checkit *crypto.PublicIdentity
err := transfer.DecodeBytes(rec.Value, &checkit)
if err != nil {
this.Log.Printf("Writer record is misformed: %s", err)
return
}
if checkit.Fingerprint().String() != rec.Key {
this.Log.Printf("Writer record is misformed, key != hash")
return
}
this.verifyUpdate(rec, owner)
}