Add chat history feature

app/backend/app.py

@@ -59,6 +59,7 @@
     CONFIG_AUTH_CLIENT,
     CONFIG_BLOB_CONTAINER_CLIENT,
     CONFIG_CHAT_APPROACH,
+    CONFIG_CHAT_HISTORY_BROWSER_ENABLED,
     CONFIG_CHAT_VISION_APPROACH,
     CONFIG_CREDENTIAL,
     CONFIG_GPT4V_DEPLOYED,
@@ -79,6 +80,7 @@
     CONFIG_VECTOR_SEARCH_ENABLED,
 )
 from core.authentication import AuthenticationHelper
+from core.sessionhelper import create_session_id
 from decorators import authenticated, authenticated_path
 from error import error_dict, error_response
 from prepdocs import (
@@ -218,10 +220,15 @@ async def chat(auth_claims: Dict[str, Any]):
         else:
             approach = cast(Approach, current_app.config[CONFIG_CHAT_APPROACH])
 
+        # If session state is provided, persists the session state,
+        # else creates a new session_id depending on the chat history options enabled.
+        session_state = request_json.get("session_state")
+        if session_state is None:
+            session_state = create_session_id(current_app.config[CONFIG_CHAT_HISTORY_BROWSER_ENABLED])
         result = await approach.run(
             request_json["messages"],
             context=context,
-            session_state=request_json.get("session_state"),
+            session_state=session_state,
         )
         return jsonify(result)
     except Exception as error:
@@ -244,10 +251,15 @@ async def chat_stream(auth_claims: Dict[str, Any]):
         else:
             approach = cast(Approach, current_app.config[CONFIG_CHAT_APPROACH])
 
+        # If session state is provided, persists the session state,
+        # else creates a new session_id depending on the chat history options enabled.
+        session_state = request_json.get("session_state")
+        if session_state is None:
+            session_state = create_session_id(current_app.config[CONFIG_CHAT_HISTORY_BROWSER_ENABLED])
         result = await approach.run_stream(
             request_json["messages"],
             context=context,
-            session_state=request_json.get("session_state"),
+            session_state=session_state,
         )
         response = await make_response(format_as_ndjson(result))
         response.timeout = None  # type: ignore
@@ -276,6 +288,7 @@ def config():
             "showSpeechInput": current_app.config[CONFIG_SPEECH_INPUT_ENABLED],
             "showSpeechOutputBrowser": current_app.config[CONFIG_SPEECH_OUTPUT_BROWSER_ENABLED],
             "showSpeechOutputAzure": current_app.config[CONFIG_SPEECH_OUTPUT_AZURE_ENABLED],
+            "showChatHistoryBrowser": current_app.config[CONFIG_CHAT_HISTORY_BROWSER_ENABLED],
         }
     )
 
@@ -439,6 +452,7 @@ async def setup_clients():
     USE_SPEECH_INPUT_BROWSER = os.getenv("USE_SPEECH_INPUT_BROWSER", "").lower() == "true"
     USE_SPEECH_OUTPUT_BROWSER = os.getenv("USE_SPEECH_OUTPUT_BROWSER", "").lower() == "true"
     USE_SPEECH_OUTPUT_AZURE = os.getenv("USE_SPEECH_OUTPUT_AZURE", "").lower() == "true"
+    USE_CHAT_HISTORY_BROWSER = os.getenv("USE_CHAT_HISTORY_BROWSER", "").lower() == "true"
 
     # WEBSITE_HOSTNAME is always set by App Service, RUNNING_IN_PRODUCTION is set in main.bicep
     RUNNING_ON_AZURE = os.getenv("WEBSITE_HOSTNAME") is not None or os.getenv("RUNNING_IN_PRODUCTION") is not None
@@ -609,6 +623,7 @@ async def setup_clients():
     current_app.config[CONFIG_SPEECH_INPUT_ENABLED] = USE_SPEECH_INPUT_BROWSER
     current_app.config[CONFIG_SPEECH_OUTPUT_BROWSER_ENABLED] = USE_SPEECH_OUTPUT_BROWSER
     current_app.config[CONFIG_SPEECH_OUTPUT_AZURE_ENABLED] = USE_SPEECH_OUTPUT_AZURE
+    current_app.config[CONFIG_CHAT_HISTORY_BROWSER_ENABLED] = USE_CHAT_HISTORY_BROWSER
 
     # Various approaches to integrate GPT and external knowledge, most applications will use a single one of these patterns
     # or some derivative, here we include several for exploration purposes

app/backend/config.py

@@ -22,3 +22,4 @@
 CONFIG_SPEECH_SERVICE_LOCATION = "speech_service_location"
 CONFIG_SPEECH_SERVICE_TOKEN = "speech_service_token"
 CONFIG_SPEECH_SERVICE_VOICE = "speech_service_voice"
+CONFIG_CHAT_HISTORY_BROWSER_ENABLED = "chat_history_browser_enabled"

app/backend/core/sessionhelper.py

@@ -0,0 +1,7 @@
+import uuid
+
+
+def create_session_id(config_chat_history_browser_enabled: bool) -> str | None:
+    if config_chat_history_browser_enabled:
+        return str(uuid.uuid4())
+    return None

app/frontend/package.json

@@ -22,6 +22,7 @@
     "i18next": "^23.12.2",
     "i18next-browser-languagedetector": "^8.0.0",
     "i18next-http-backend": "^2.5.2",
+    "idb": "^8.0.0",
     "ndjson-readablestream": "^1.2.0",
     "react": "^18.3.1",
     "react-dom": "^18.3.1",

app/frontend/src/api/models.ts

@@ -89,6 +89,7 @@ export type Config = {
     showSpeechInput: boolean;
     showSpeechOutputBrowser: boolean;
     showSpeechOutputAzure: boolean;
+    showChatHistoryBrowser: boolean;
 };
 
 export type SimpleAPIResponse = {

app/frontend/src/components/HistoryButton/HistoryButton.module.css

@@ -0,0 +1,7 @@
+.container {
+    display: flex;
+    align-items: center;
+    gap: 0.375em;
+    cursor: pointer;
+    padding: 0.5rem;
+}

app/frontend/src/components/HistoryButton/HistoryButton.tsx

@@ -0,0 +1,22 @@
+import { History24Regular } from "@fluentui/react-icons";
+import { Button } from "@fluentui/react-components";
+import { useTranslation } from "react-i18next";
+
+import styles from "./HistoryButton.module.css";
+
+interface Props {
+    className?: string;
+    onClick: () => void;
+    disabled?: boolean;
+}
+
+export const HistoryButton = ({ className, disabled, onClick }: Props) => {
+    const { t } = useTranslation();
+    return (
+        <div className={`${styles.container} ${className ?? ""}`}>
+            <Button icon={<History24Regular />} disabled={disabled} onClick={onClick}>
+                {t("history.openChatHistory")}
+            </Button>
+        </div>
+    );
+};

app/frontend/src/components/HistoryButton/index.tsx

@@ -0,0 +1 @@
+export * from "./HistoryButton";

app/frontend/src/components/HistoryItem/HistoryItem.module.css

@@ -0,0 +1,120 @@
+.historyItem {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    padding: 4px 8px;
+    border-radius: 6px;
+    transition: background-color 0.2s;
+}
+
+.historyItem:hover {
+    background-color: #f3f4f6;
+}
+
+.historyItemButton {
+    flex-grow: 1;
+    text-align: left;
+    padding: 0;
+    margin-right: 4px;
+    background: none;
+    border: none;
+    cursor: pointer;
+}
+
+.historyItemTitle {
+    font-size: 1rem;
+}
+
+.deleteIcon {
+    width: 20px;
+    height: 20px;
+}
+
+.deleteButton {
+    opacity: 0;
+    transition: opacity 0.2s;
+    background: none;
+    border: none;
+    cursor: pointer;
+    padding: 4px;
+    border-radius: 9999px;
+    color: #6b7280;
+}
+
+.historyItem:hover .deleteButton,
+.deleteButton:focus {
+    opacity: 1;
+}
+
+.deleteButton:hover {
+    color: #111827;
+}
+
+.modalOverlay {
+    position: fixed;
+    top: 0;
+    left: 0;
+    right: 0;
+    bottom: 0;
+    background-color: rgba(0, 0, 0, 0.5);
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    z-index: 50;
+}
+
+.modalContent {
+    background-color: white;
+    padding: 24px;
+    border-radius: 8px;
+    box-shadow:
+        0 4px 6px -1px rgba(0, 0, 0, 0.1),
+        0 2px 4px -1px rgba(0, 0, 0, 0.06);
+    max-width: 400px;
+    width: 100%;
+}
+
+.modalTitle {
+    font-size: 20px;
+    font-weight: 600;
+    margin-top: 0px;
+    margin-bottom: 16px;
+}
+
+.modalDescription {
+    margin-top: 0px;
+    margin-bottom: 16px;
+}
+
+.modalActions {
+    display: flex;
+    justify-content: flex-end;
+    gap: 16px;
+}
+
+.modalCancelButton,
+.modalConfirmButton {
+    padding: 8px 16px;
+    border-radius: 4px;
+    font-size: 14px;
+    font-weight: 500;
+    cursor: pointer;
+}
+
+.modalCancelButton {
+    background-color: #f3f4f6;
+    color: #374151;
+}
+
+.modalConfirmButton {
+    background-color: #ef4444;
+    color: white;
+}
+
+.modalCancelButton:hover {
+    background-color: #e5e7eb;
+}
+
+.modalConfirmButton:hover {
+    background-color: #dc2626;
+}

app/frontend/src/components/HistoryItem/HistoryItem.tsx

@@ -0,0 +1,59 @@
+import { useState, useCallback } from "react";
+import { useTranslation } from "react-i18next";
+import styles from "./HistoryItem.module.css";
+import { DefaultButton } from "@fluentui/react";
+import { Delete24Regular } from "@fluentui/react-icons";
+
+export interface HistoryData {
+    id: string;
+    title: string;
+    timestamp: number;
+}
+
+interface HistoryItemProps {
+    item: HistoryData;
+    onSelect: (id: string) => void;
+    onDelete: (id: string) => void;
+}
+
+export function HistoryItem({ item, onSelect, onDelete }: HistoryItemProps) {
+    const [isModalOpen, setIsModalOpen] = useState(false);
+
+    const handleDelete = useCallback(() => {
+        setIsModalOpen(false);
+        onDelete(item.id);
+    }, [item.id, onDelete]);
+
+    return (
+        <div className={styles.historyItem}>
+            <button onClick={() => onSelect(item.id)} className={styles.historyItemButton}>
+                <div className={styles.historyItemTitle}>{item.title}</div>
+            </button>
+            <button onClick={() => setIsModalOpen(true)} className={styles.deleteButton} aria-label="delete this chat history">
+                <Delete24Regular className={styles.deleteIcon} />
+            </button>
+            <DeleteHistoryModal isOpen={isModalOpen} onClose={() => setIsModalOpen(false)} onConfirm={handleDelete} />
+        </div>
+    );
+}
+
+function DeleteHistoryModal({ isOpen, onClose, onConfirm }: { isOpen: boolean; onClose: () => void; onConfirm: () => void }) {
+    if (!isOpen) return null;
+    const { t } = useTranslation();
+    return (
+        <div className={styles.modalOverlay}>
+            <div className={styles.modalContent}>
+                <h2 className={styles.modalTitle}>{t("history.deleteModalTitle")}</h2>
+                <p className={styles.modalDescription}>{t("history.deleteModalDescription")}</p>
+                <div className={styles.modalActions}>
+                    <DefaultButton onClick={onClose} className={styles.modalCancelButton}>
+                        {t("history.cancelLabel")}
+                    </DefaultButton>
+                    <DefaultButton onClick={onConfirm} className={styles.modalConfirmButton}>
+                        {t("history.deleteLabel")}
+                    </DefaultButton>
+                </div>
+            </div>
+        </div>
+    );
+}

app/frontend/src/components/HistoryItem/index.tsx

@@ -0,0 +1 @@
+export * from "./HistoryItem";

app/frontend/src/components/HistoryPanel/HistoryPanel.module.css

@@ -0,0 +1,14 @@
+.group {
+    margin-top: 1rem;
+}
+.groupLabel {
+    font-size: 0.9rem;
+    font-weight: bold;
+    margin-top: 0.5rem;
+    margin-bottom: 0.2rem;
+}
+
+.footer {
+    display: flex;
+    justify-content: space-between;
+}