port(upstream#2007): 23 more names in the channel rainbow list

channel-rainbow.json

@@ -295,5 +295,28 @@
   "#bogota": "6d0864985b64350ce4cbfebf4979e970",
   "#peru": "7e6fc347bf29a4c128ac3156865bd521",
   "#lima": "5f167ce354eca08ab742463df10ef255",
-  "Public": "8b3387e9c5cdea6ac9e5edbaa115cd72"
+  "Public": "8b3387e9c5cdea6ac9e5edbaa115cd72",
+  "#Public": "7534fe292203ccdce93db79377d4b566",
+  "#newbie": "ff2ecc59f59dbf051a10d880f0b4308d",
+  "#power": "c4d23a51329aeaee767234644d52cff8",
+  "#garden": "56ff6fe3500872c2765dbc178350005c",
+  "#jokes": "abe610d61dee508c0ac18793c36c41c3",
+  "#space": "5caa27568ba7a216bcc09fcb69c77ea1",
+  "#path": "29eed6c759d96346b30c869e23fd86f8",
+  "#hamradio": "83c8b01997654265938da8765cbc7db9",
+  "#amrron": "68ec397a1dd4f3416911d00211ed0ef6",
+  "#family": "7d1b805d4bf059c2ef06ed221794663b",
+  "#testing": "cde5e82cf515647dcb547a79a4f065d1",
+  "#wicked": "05e990d48943ee03c943c41dea0ddfe1",
+  "#gay": "3a612fa3bfc9f3b439cc230b01cbbc00",
+  "#t": "7b5336e85005be805b496bc27c722ff3",
+  "#doom": "7034910637d6b9b6c2cc3bcd8dfe9bb5",
+  "#empty": "3351cfa0dad99e1777cce210c983b561",
+  "#puppy": "c20cf85aab9561e6e65ac4a19a852198",
+  "#naked": "f423f23ddcf9e472c2ace38dce7591bc",
+  "#cruising": "550857053360e3492755251f9142e74c",
+  "#nightowls": "1411c5c3732d3df1b855644f78c47417",
+  "#worldcup": "d5786cc7bcee5a4828bbb20c3825c5a9",
+  "#nofilter": "cab31f589959debcd1721b7d252259b1",
+  "#politics": "64cc9fdaad67f03f23b4cec8c9a4468f"
 }

internal/channel/channel_rainbow_test.go

@@ -0,0 +1,97 @@
+package channel
+
+import (
+	"bytes"
+	"encoding/hex"
+	"encoding/json"
+	"io"
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+const expectedRainbowEntryCount = 320
+
+func TestChannelRainbowMatchesDeriveKey(t *testing.T) {
+	data, err := os.ReadFile(filepath.Join("..", "..", "channel-rainbow.json"))
+	if err != nil {
+		t.Fatalf("read channel-rainbow.json: %v", err)
+	}
+	if !json.Valid(data) {
+		t.Fatal("channel-rainbow.json is not valid JSON")
+	}
+
+	entries := decodeUniqueRainbowEntries(t, data)
+	if got := len(entries); got != expectedRainbowEntryCount {
+		t.Fatalf("channel-rainbow.json has %d entries, want %d", got, expectedRainbowEntryCount)
+	}
+
+	seenKeys := make(map[string]string, len(entries))
+	for name, got := range entries {
+		if otherName, exists := seenKeys[got]; exists {
+			t.Errorf("duplicate channel key %q used by %q and %q", got, otherName, name)
+		} else {
+			seenKeys[got] = name
+		}
+
+		if name == "Public" {
+			// Public is the firmware-default PSK, not a hashtag-derived key.
+			if want := "8b3387e9c5cdea6ac9e5edbaa115cd72"; got != want {
+				t.Errorf("Public key = %q, want firmware default %q", got, want)
+			}
+			continue
+		}
+
+		want := hex.EncodeToString(DeriveKey(name))
+		if got != want {
+			t.Errorf("%s key = %q, want DeriveKey result %q", name, got, want)
+		}
+	}
+}
+
+func decodeUniqueRainbowEntries(t *testing.T, data []byte) map[string]string {
+	t.Helper()
+	dec := json.NewDecoder(bytes.NewReader(data))
+
+	opening, err := dec.Token()
+	if err != nil {
+		t.Fatalf("decode opening token: %v", err)
+	}
+	if opening != json.Delim('{') {
+		t.Fatalf("channel-rainbow.json must contain an object, got %v", opening)
+	}
+
+	entries := make(map[string]string)
+	for dec.More() {
+		nameToken, err := dec.Token()
+		if err != nil {
+			t.Fatalf("decode channel name: %v", err)
+		}
+		name, ok := nameToken.(string)
+		if !ok {
+			t.Fatalf("channel name must be a string, got %T", nameToken)
+		}
+		if _, exists := entries[name]; exists {
+			t.Fatalf("duplicate channel name %q", name)
+		}
+
+		var key string
+		if err := dec.Decode(&key); err != nil {
+			t.Fatalf("decode key for %q: %v", name, err)
+		}
+		entries[name] = key
+	}
+
+	closing, err := dec.Token()
+	if err != nil {
+		t.Fatalf("decode closing token: %v", err)
+	}
+	if closing != json.Delim('}') {
+		t.Fatalf("channel-rainbow.json object is not closed, got %v", closing)
+	}
+	if err := dec.Decode(&struct{}{}); err != io.EOF {
+		t.Fatalf("unexpected content after channel-rainbow.json object: %v", err)
+	}
+
+	return entries
+}