aptok/remoteActor.go

package activityserve

import (
	"encoding/json"
	"encoding/pem"
	"github.com/gologme/log"
	"crypto/x509"
	"crypto/rsa"
)

// RemoteActor is a type that holds an actor
 // that we want to interact with
type RemoteActor struct {
	iri, outbox, inbox, sharedInbox string
	url                             string
	info                            map[string]interface{}
	publicKey *rsa.PublicKey
}

// NewRemoteActor returns a remoteActor which holds
// all the info required for an actor we want to
// interact with (not essentially sitting in our instance)
func NewRemoteActor(iri string) (RemoteActor, error) {
	info, err := get(iri)
	if err != nil {
		log.Info("Couldn't get remote actor information")
		log.Info(err)
		return RemoteActor{}, err
	}
	publicKeyBlock := info["publicKey"].(map[string]interface {})
	publicKeyPem := publicKeyBlock["publicKeyPem"].(string)
	spkiBlock, _ := pem.Decode([]byte(publicKeyPem))
	var spkiKey *rsa.PublicKey
	pubInterface, _ := x509.ParsePKIXPublicKey(spkiBlock.Bytes)
	spkiKey = pubInterface.(*rsa.PublicKey)
	outbox, _ := info["outbox"].(string)
	inbox, _ := info["inbox"].(string)
	url, _ := info["url"].(string)
	var endpoints map[string]interface{}
	var sharedInbox string
	if info["endpoints"] != nil {
		endpoints = info["endpoints"].(map[string]interface{})
		if val, ok := endpoints["sharedInbox"]; ok {
			sharedInbox = val.(string)
		}
	}

	return RemoteActor{
		iri:         iri,
		outbox:      outbox,
		inbox:       inbox,
		sharedInbox: sharedInbox,
		url:         url,
		publicKey: spkiKey,
	}, err
}

func (ra RemoteActor) getLatestPosts(number int) (map[string]interface{}, error) {
	return get(ra.outbox)
}

func get(iri string) (info map[string]interface{}, err error) {

	sactor,err := GetActor("server","Internal service actor","Service")
	if err != nil {
		log.Info("Failed to get service actor")
		log.Info(err)
		return
	}
	responseData,err := sactor.signedHTTPGet(iri)
	if err != nil {
		log.Info("Failed to make signed http get request")
		log.Info(err)
		return
	}
	var e interface{}
	err = json.Unmarshal([]byte(responseData), &e)

	if err != nil {
		log.Info("something went wrong when unmarshalling the json")
		log.Info(err)
		return
	}
	info = e.(map[string]interface{})

	return
}

// GetInbox returns the inbox url of the actor
func (ra RemoteActor) GetInbox() string {
	return ra.inbox
}

// GetSharedInbox returns the inbox url of the actor
func (ra RemoteActor) GetSharedInbox() string {
	if ra.sharedInbox == "" {
		return ra.inbox
	}
	return ra.sharedInbox
}

func (ra RemoteActor) URL() string {
	return ra.url
}