feat: Human Input Node (#32060)

The frontend and backend implementation for the human input node.

Co-authored-by: twwu <twwu@dify.ai>
Co-authored-by: JzoNg <jzongcode@gmail.com>
Co-authored-by: yyh <92089059+lyzno1@users.noreply.github.com>
Co-authored-by: zhsama <torvalds@linux.do>

api/configs/feature/__init__.py

@@ -1,3 +1,4 @@
+from datetime import timedelta
 from enum import StrEnum
 from typing import Literal
 
@@ -48,6 +49,16 @@ class SecurityConfig(BaseSettings):
         default=5,
     )
 
+    WEB_FORM_SUBMIT_RATE_LIMIT_MAX_ATTEMPTS: PositiveInt = Field(
+        description="Maximum number of web form submissions allowed per IP within the rate limit window",
+        default=30,
+    )
+
+    WEB_FORM_SUBMIT_RATE_LIMIT_WINDOW_SECONDS: PositiveInt = Field(
+        description="Time window in seconds for web form submission rate limiting",
+        default=60,
+    )
+
     LOGIN_DISABLED: bool = Field(
         description="Whether to disable login checks",
         default=False,
@@ -82,6 +93,12 @@ class AppExecutionConfig(BaseSettings):
         default=0,
     )
 
+    HUMAN_INPUT_GLOBAL_TIMEOUT_SECONDS: PositiveInt = Field(
+        description="Maximum seconds a workflow run can stay paused waiting for human input before global timeout.",
+        default=int(timedelta(days=7).total_seconds()),
+        ge=1,
+    )
+
 
 class CodeExecutionSandboxConfig(BaseSettings):
     """
@@ -1134,6 +1151,14 @@ class CeleryScheduleTasksConfig(BaseSettings):
         description="Enable queue monitor task",
         default=False,
     )
+    ENABLE_HUMAN_INPUT_TIMEOUT_TASK: bool = Field(
+        description="Enable human input timeout check task",
+        default=True,
+    )
+    HUMAN_INPUT_TIMEOUT_TASK_INTERVAL: PositiveInt = Field(
+        description="Human input timeout check interval in minutes",
+        default=1,
+    )
     ENABLE_CHECK_UPGRADABLE_PLUGIN_TASK: bool = Field(
         description="Enable check upgradable plugin task",
         default=True,

api/configs/middleware/__init__.py

@@ -6,6 +6,7 @@ from pydantic import Field, NonNegativeFloat, NonNegativeInt, PositiveFloat, Pos
 from pydantic_settings import BaseSettings
 
 from .cache.redis_config import RedisConfig
+from .cache.redis_pubsub_config import RedisPubSubConfig
 from .storage.aliyun_oss_storage_config import AliyunOSSStorageConfig
 from .storage.amazon_s3_storage_config import S3StorageConfig
 from .storage.azure_blob_storage_config import AzureBlobStorageConfig
@@ -317,6 +318,7 @@ class MiddlewareConfig(
     CeleryConfig,  # Note: CeleryConfig already inherits from DatabaseConfig
     KeywordStoreConfig,
     RedisConfig,
+    RedisPubSubConfig,
     # configs of storage and storage providers
     StorageConfig,
     AliyunOSSStorageConfig,

api/configs/middleware/cache/redis_pubsub_config.py

@@ -0,0 +1,96 @@
+from typing import Literal, Protocol
+from urllib.parse import quote_plus, urlunparse
+
+from pydantic import Field
+from pydantic_settings import BaseSettings
+
+
+class RedisConfigDefaults(Protocol):
+    REDIS_HOST: str
+    REDIS_PORT: int
+    REDIS_USERNAME: str | None
+    REDIS_PASSWORD: str | None
+    REDIS_DB: int
+    REDIS_USE_SSL: bool
+    REDIS_USE_SENTINEL: bool | None
+    REDIS_USE_CLUSTERS: bool
+
+
+class RedisConfigDefaultsMixin:
+    def _redis_defaults(self: RedisConfigDefaults) -> RedisConfigDefaults:
+        return self
+
+
+class RedisPubSubConfig(BaseSettings, RedisConfigDefaultsMixin):
+    """
+    Configuration settings for Redis pub/sub streaming.
+    """
+
+    PUBSUB_REDIS_URL: str | None = Field(
+        alias="PUBSUB_REDIS_URL",
+        description=(
+            "Redis connection URL for pub/sub streaming events between API "
+            "and celery worker, defaults to url constructed from "
+            "`REDIS_*` configurations"
+        ),
+        default=None,
+    )
+
+    PUBSUB_REDIS_USE_CLUSTERS: bool = Field(
+        description=(
+            "Enable Redis Cluster mode for pub/sub streaming. It's highly "
+            "recommended to enable this for large deployments."
+        ),
+        default=False,
+    )
+
+    PUBSUB_REDIS_CHANNEL_TYPE: Literal["pubsub", "sharded"] = Field(
+        description=(
+            "Pub/sub channel type for streaming events. "
+            "Valid options are:\n"
+            "\n"
+            " - pubsub: for normal Pub/Sub\n"
+            " - sharded: for sharded Pub/Sub\n"
+            "\n"
+            "It's highly recommended to use sharded Pub/Sub AND redis cluster "
+            "for large deployments."
+        ),
+        default="pubsub",
+    )
+
+    def _build_default_pubsub_url(self) -> str:
+        defaults = self._redis_defaults()
+        if not defaults.REDIS_HOST or not defaults.REDIS_PORT:
+            raise ValueError("PUBSUB_REDIS_URL must be set when default Redis URL cannot be constructed")
+
+        scheme = "rediss" if defaults.REDIS_USE_SSL else "redis"
+        username = defaults.REDIS_USERNAME or None
+        password = defaults.REDIS_PASSWORD or None
+
+        userinfo = ""
+        if username:
+            userinfo = quote_plus(username)
+        if password:
+            password_part = quote_plus(password)
+            userinfo = f"{userinfo}:{password_part}" if userinfo else f":{password_part}"
+        if userinfo:
+            userinfo = f"{userinfo}@"
+
+        host = defaults.REDIS_HOST
+        port = defaults.REDIS_PORT
+        db = defaults.REDIS_DB
+
+        netloc = f"{userinfo}{host}:{port}"
+        return urlunparse((scheme, netloc, f"/{db}", "", "", ""))
+
+    @property
+    def normalized_pubsub_redis_url(self) -> str:
+        pubsub_redis_url = self.PUBSUB_REDIS_URL
+        if pubsub_redis_url:
+            cleaned = pubsub_redis_url.strip()
+            pubsub_redis_url = cleaned or None
+
+        if pubsub_redis_url:
+            return pubsub_redis_url
+
+        return self._build_default_pubsub_url()