Make error less brittle to fix upcoming error with HCP SDK Go changing how we return 404 error

internal/hcp/api/errors.go

@@ -5,7 +5,8 @@ package api
 
 import (
 	"fmt"
-	"strings"
+	"regexp"
+	"strconv"
 
 	"google.golang.org/grpc/codes"
 )
@@ -26,6 +27,8 @@ func (c *ClientError) Error() string {
 	return fmt.Sprintf("status %d: err %v", c.StatusCode, c.Err)
 }
 
+var errCodeRegex = regexp.MustCompilePOSIX(`[Cc]ode"?:([0-9]+)`)
+
 // CheckErrorCode checks the error string for err for some code and returns true
 // if the code is found. Ideally this function should use status.FromError
 // https://pkg.go.dev/google.golang.org/grpc/status#pkg-functions but that
@@ -35,5 +38,15 @@ func CheckErrorCode(err error, code codes.Code) bool {
 		return false
 	}
 
-	return strings.Contains(err.Error(), fmt.Sprintf("Code:%d", code))
+	// If the error string doesn't match the code we're looking for, we
+	// can ignore it and return false immediately.
+	matches := errCodeRegex.FindStringSubmatch(err.Error())
+	if len(matches) == 0 {
+		return false
+	}
+
+	// Safe to ignore the error here since the regex's submatch is always a
+	// valid integer given the format ([0-9]+)
+	errCode, _ := strconv.Atoi(matches[1])
+	return errCode == int(code)
 }

internal/hcp/api/errors_test.go

@@ -0,0 +1,57 @@
+package api
+
+import (
+	"fmt"
+	"testing"
+
+	"google.golang.org/grpc/codes"
+)
+
+func TestCheckErrorCode(t *testing.T) {
+	tests := []struct {
+		name          string
+		codeString    string
+		expectCode    codes.Code
+		expectSuccess bool
+	}{
+		{
+			"old format, code matches what is looked for",
+			`{Code:5,"details":[],"message":"Error: The bucket etc."}`,
+			codes.Code(5),
+			true,
+		},
+		{
+			"old format, code doesn't match what is looked for",
+			`{Code:55,"details":[],"message":"Error: The bucket etc."}`,
+			codes.Code(5),
+			false,
+		},
+		{
+			"new format, code matches what is looked for",
+			`{"code":5,"details":[],"message":"Error: The bucket etc."}`,
+			codes.Code(5),
+			true,
+		},
+		{
+			"new format, code doesn't match what is looked for",
+			`{"code":55,"details":[],"message":"Error: The bucket etc."}`,
+			codes.Code(5),
+			false,
+		},
+		{
+			"bad format, should always be false",
+			`"ceod":55`,
+			codes.Code(5),
+			false,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			found := CheckErrorCode(fmt.Errorf(tt.codeString), tt.expectCode)
+			if found != tt.expectSuccess {
+				t.Errorf("check error code returned %t, expected %t", found, tt.expectSuccess)
+			}
+		})
+	}
+}