internal/genai, cmd/vulnreport: remove support for legacy PaLM API

The Gemini API has fully replaced the PaLM API so there is no need for
us to maintain support.

Change-Id: I1e6581313b481a7ce9042d5ef82e99cb45ee48cf
Reviewed-on: https://go-review.googlesource.com/c/vulndb/+/559598
Reviewed-by: Damien Neil <[email protected]>
LUCI-TryBot-Result: Go LUCI <[email protected]>

Author: tatianab

cmd/vulnreport/suggest.go

@@ -17,7 +17,6 @@ import (
 var (
 	interactive    = flag.Bool("i", false, "for suggest, interactive mode")
 	numSuggestions = flag.Int("n", 4, "for suggest, the number of suggestions to attempt to generate (max is 8)")
-	palm           = flag.Bool("palm", false, "use the legacy PaLM API instead of the Gemini API")
 )
 
 func suggestCmd(ctx context.Context, filename string) (err error) {
@@ -28,16 +27,10 @@ func suggestCmd(ctx context.Context, filename string) (err error) {
 		return err
 	}
 
-	var c genai.Client
-	if *palm {
-		infolog.Print("contacting the PaLM API...")
-		c = genai.NewDefaultPaLMClient()
-	} else {
-		infolog.Print("contacting the Gemini API... (set flag -palm to use legacy PaLM API instead)")
-		c, err = genai.NewGeminiClient(ctx)
-		if err != nil {
-			return err
-		}
+	infolog.Print("contacting the Gemini API...")
+	c, err := genai.NewGeminiClient(ctx)
+	if err != nil {
+		return err
 	}
 
 	suggestions, err := suggest(ctx, c, r, *numSuggestions)

internal/genai/gen_examples/main.go

@@ -3,7 +3,8 @@
 // license that can be found in the LICENSE file.
 
 // Command gen_examples generates and stores examples
-// that can be used to create prompts / training inputs for the PaLM API.
+// that can be used to create prompts / training inputs for Google's
+// Generative AI APIs.
 package main
 
 import (