[minor] Create an API endpoint for agents to retrieve PGP public keys…

… and update the documentation for api endpoints fixes #240

doc/api.rst

@@ -64,6 +64,41 @@ GET /api/v1/ip
 	$ curl https://api.mig.mozilla.org/api/v1/ip
 	108.36.248.44
 
+GET /api/v1/publickey/<pgp_fingerprint>
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+* Description: basic endpoint that returns the armored public key that
+  corresponds to the pgp fingerprint
+* Parameters: pgp_fingerprint
+* Authentication: none
+* Response Code: 200 OK
+* Response: Text
+
+.. code:: bash
+
+	$ curl https://api.mig.mozilla.org/api/v1/publickey/124F824DC2336D1492D3EC3344D73A94E9CF5B7D
+	-----BEGIN PGP PUBLIC KEY BLOCK-----
+
+	xo0EV9ETlQEEANbHxZhpLNb0FYhLgIxNpMlboBYJFFrG4RQ5UiWC7bBjyyhvSlsz
+	thneplAws16VFCjsf6FWNF4kmFQdN16Yb8onchE8Rqs7UlFiHijrBOGZC2xe8ZKC
+	J0r2cB3229mrfo38bVh5Mji/jhfLMbXIBALQE2SR5fQYi1RR9eY0e/hRABEBAAHN
+	LnN1bm55IEludmVzdGlnYXRvciA8c3VubnlAc3VubnktQXNwaXJlLUUxLTU3Mj7C
+	vgQTAQIAKAUCV9ETlQIbLwUJAdqcAAYLCQgHAwIGFQgCCQoLBBYCAwECHgECF4AA
+	CgkQRNc6lOnPW31ybQQAxRHnANkAzIQyFa3QnHMMJqFppBpHb5/e4kYK/kyKEepk
+	1HNd8z5vK4+EzMAhqKYiGhr76J2xOaYBgXNpGaUMLaUpVVoooTnzFs16ZfowSQX5
+	TnFbFb6wlC8e6EWbvL+YoIT+MgMs7DpI2d1TAP7+xtyrBhUhYdULtppf38FpSVvO
+	jQRX0ROVAQQA1PvrbQtjwbGTZGil6CO/oAh2f7+s4p3LtM3inHIfYUkCW2Pfuc9K
+	vTm0PmCjRvj4HPN/uGvI+4YebnsPzx55UW4L8V7yRR1gq0470McTnTzrUfk5H3LT
+	MGVIgw0zJrd6J71MfPW8CPzskvtPATlILm8qNAA3JtxB4aY+4U1z5mEAEQEAAcLA
+	gwQYAQIADwUCV9ETlQIbLgUJAdqcAACoCRBE1zqU6c9bfZ0gBBkBAgAGBQJX0ROV
+	AAoJEK+0jauhp1rQUM8EALAo4U19p8PTroqTL1CoiOGeA5nD226cTw1k2EtOlpeG
+	hCFgnVaqud8Qcqjrb/Nj4r16Al6c8yKo6MHuiTcQdGLQQqtNnVG0uWqAJfWgegP7
+	6MMpon5pHhsmoHru7c62k6wVCCckcOeMYkbap/wzzrQkBKDnOgr+JZUbT98LqxdG
+	WKMEANaDkidz5EUEjbDRNMox5AKJneuJE8qVLesGMUzuLqbvfl+Tykrlymxz+fgk
+	x70Wkz1u0YYw5GuNyrA9yYUcbyux1mllBVFFJoJ7Rl29oSmZUTCxMqp8230NItpD
+	irj/IaB7HMP+QRKXvL9GvCSxRCwTxKdleGbYMbJWk36NX2gn
+	=B/u/
+	-----END PGP PUBLIC KEY BLOCK-----
+
 GET /api/v1/dashboard
 ~~~~~~~~~~~~~~~~~~~~~
 * Description: returns a status dashboard with counters of active and idle
@@ -1417,4 +1452,3 @@ Authentication with X-LOADERKEY
 X-LOADERKEY is a simple authentication method used by loader instances to authenticate
 with the API. The X-LOADERKEY header is included with the request, and is set to the loader
 key value for the requesting loader instance.
-

mig-api/api.go

@@ -18,6 +18,7 @@ import (
 	"github.com/gorilla/mux"
 	"github.com/jvehent/cljs"
 	"mig.ninja/mig"
+	"mig.ninja/mig/pgp"
 )
 
 var ctx Context
@@ -72,6 +73,7 @@ func main() {
 	// unauthenticated endpoints
 	s.HandleFunc("/heartbeat", getHeartbeat).Methods("GET")
 	s.HandleFunc("/ip", getIP).Methods("GET")
+	s.HandleFunc("/publickey/{pgp_fingerprint}", getPublicKey).Methods("GET")
 
 	// Loader manifest endpoints, use loader specific authentication on
 	// the request
@@ -438,6 +440,49 @@ func getIP(respWriter http.ResponseWriter, request *http.Request) {
 	respond(http.StatusOK, []byte(remotePublicIP(request)), respWriter, request)
 }
 
+// getPublicKey takes an pgp_fingerprint and returns corresponding publickey
+func getPublicKey(respWriter http.ResponseWriter, request *http.Request) {
+	var err error
+	opid := getOpID(request)
+	defer func() {
+		if e := recover(); e != nil {
+			emsg := fmt.Sprintf("%v", e)
+			ctx.Channels.Log <- mig.Log{OpID: opid, Desc: emsg}.Err()
+			respond(http.StatusInternalServerError, emsg, respWriter, request)
+		}
+		ctx.Channels.Log <- mig.Log{OpID: opid, Desc: "leaving getPublicKey()"}.Debug()
+	}()
+	vars := mux.Vars(request)
+	fp := vars["pgp_fingerprint"]
+
+	// retrieve the publickey
+	var inv mig.Investigator
+	if fp != "" {
+		inv, err = ctx.DB.InvestigatorByFingerprint(fp)
+		if err != nil {
+			if fmt.Sprintf("%v", err) == fmt.Sprintf("InvestigatorByFingerprint: no investigator found for fingerprint '%s'", fp) {
+				// not found, return 404
+				emsg := fmt.Sprintf("Invalid Fingerprint : No PublicKey found for fingerprint '%s'", fp)
+				respond(http.StatusNotFound, []uint8(emsg), respWriter, request)
+				return
+			} else {
+				panic(err)
+			}
+		}
+	} else {
+		// bad request, return 400
+		emsg := fmt.Sprintf("No Fingerprint specified")
+		respond(http.StatusBadRequest, []uint8(emsg), respWriter, request)
+		return
+	}
+	// fetch the armoredPubKey
+	armoredPubKey, err := pgp.ArmorPubKey(inv.PublicKey)
+	if err != nil {
+		panic(err)
+	}
+	respond(http.StatusOK, armoredPubKey, respWriter, request)
+}
+
 func getDashboard(respWriter http.ResponseWriter, request *http.Request) {
 	var (
 		err         error