systemprompt-models 0.55.0

//! MCP server deployment configuration.
//!
//! [`DeploymentConfig`] is the top-level shape loaded from MCP service YAML:
//! a map of named [`Deployment`]s plus global [`Settings`]. Each deployment
//! declares its [`McpServerType`], OAuth requirement, schemas, and per-tool
//! [`ToolMetadata`]. Internal-server endpoints are validated relative by
//! [`Deployment::validate`].
//!
//! Copyright (c) systemprompt.io — Business Source License 1.1.
//! See <https://systemprompt.io> for licensing details.

pub use super::connector::{ConnectorConfig, ConnectorIdentity};
use crate::ai::ToolModelConfig;
use crate::auth::{JwtAudience, Permission};
use crate::errors::ConfigValidationError;
use crate::mcp::capabilities::ToolVisibility;
use serde::{Deserialize, Serialize};
use std::collections::HashMap;
use systemprompt_identifiers::ClientId;

#[derive(Debug, Clone, Copy, Default, Serialize, Deserialize, PartialEq, Eq)]
pub enum McpServerType {
    #[default]
    #[serde(rename = "internal")]
    Internal,
    #[serde(rename = "external")]
    External,
}

impl McpServerType {
    pub const fn as_str(&self) -> &'static str {
        match self {
            Self::Internal => "internal",
            Self::External => "external",
        }
    }
}

#[derive(Debug, Clone, Serialize, Deserialize, Default)]
pub struct ToolUiConfig {
    #[serde(default = "default_resource_uri_template")]
    pub resource_uri_template: String,
    #[serde(default = "default_visibility_enum")]
    pub visibility: Vec<ToolVisibility>,
}

fn default_resource_uri_template() -> String {
    "ui://systemprompt/{artifact_id}".to_owned()
}

fn default_visibility_enum() -> Vec<ToolVisibility> {
    vec![ToolVisibility::Model, ToolVisibility::App]
}

#[derive(Debug, Clone, Serialize, Deserialize, Default)]
pub struct ToolMetadata {
    #[serde(default)]
    pub terminal_on_success: bool,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub model_config: Option<ToolModelConfig>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub ui: Option<ToolUiConfig>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct DeploymentConfig {
    pub deployments: HashMap<String, Deployment>,
    pub settings: Settings,
}

/// One MCP server as declared in the services tree.
///
/// `tool_policy` is the default decision a bridge-managed client applies to
/// every tool this server exposes and is required on every enabled server:
/// a server that declares none has no decision the bridge can enforce, so it
/// is withheld from the signed bridge manifest and startup validation reports
/// it as an error. `allow` skips the client's per-call prompt (the governance
/// chain already judges every call); `prompt` or `deny` opt the server back
/// into the client's confirmation or block it.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Deployment {
    #[serde(default, alias = "type")]
    pub server_type: McpServerType,
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub binary: Option<String>,
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub package: Option<String>,
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub port: Option<u16>,
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub endpoint: Option<String>,
    pub enabled: bool,
    pub display_in_web: bool,
    #[serde(default)]
    pub dev_only: bool,
    #[serde(default)]
    pub schemas: Vec<SchemaDefinition>,
    pub oauth: OAuthRequirement,
    #[serde(default)]
    pub tools: HashMap<String, ToolMetadata>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub model_config: Option<ToolModelConfig>,
    #[serde(default)]
    pub env_vars: Vec<String>,
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub external_auth: Option<ExternalAuth>,
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub connector: Option<ConnectorConfig>,
    #[serde(default, skip_serializing_if = "HashMap::is_empty")]
    pub headers: HashMap<String, String>,
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub tool_policy: Option<crate::bridge::ids::ToolPolicy>,
}

/// Per-user bearer resolution for an `external` MCP server.
///
/// The MCP gateway exposes no token vault of its own; instead an extension
/// banks the calling user's third-party token and serves it from
/// `token_endpoint`. At tool-call time core `GET`s that accessor with the
/// user's systemprompt JWT and injects the returned bearer onto `header` (as
/// `{scheme} {token}`), replacing the systemprompt credential so nothing
/// internal reaches the third party.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ExternalAuth {
    pub token_endpoint: String,
    #[serde(default = "default_auth_header")]
    pub header: String,
    #[serde(default = "default_auth_scheme")]
    pub scheme: String,
}

fn default_auth_header() -> String {
    "Authorization".to_owned()
}

fn default_auth_scheme() -> String {
    "Bearer".to_owned()
}

impl ExternalAuth {
    pub fn header_value(&self, bearer: &str) -> String {
        if self.scheme.trim().is_empty() {
            bearer.to_owned()
        } else {
            format!("{} {bearer}", self.scheme)
        }
    }
}

impl Deployment {
    pub fn validate(&self, name: &str) -> Result<(), ConfigValidationError> {
        match self.server_type {
            McpServerType::Internal => self.validate_internal(name)?,
            McpServerType::External => self.validate_external(name)?,
        }
        if let Some(connector) = self.connector.as_ref() {
            self.validate_connector(name, connector)?;
        }
        if let Some(ext) = self.external_auth.as_ref() {
            validate_external_auth(name, ext)?;
        }
        Ok(())
    }

    fn validate_internal(&self, name: &str) -> Result<(), ConfigValidationError> {
        if self.binary.as_deref().is_none_or(|b| b.trim().is_empty()) || self.port.is_none() {
            return Err(ConfigValidationError::invalid_field(format!(
                "MCP server '{name}': internal servers require a binary and a port."
            )));
        }
        if let Some(ep) = self.endpoint.as_deref()
            && (ep.starts_with("http://") || ep.starts_with("https://"))
        {
            return Err(ConfigValidationError::invalid_field(format!(
                "MCP server '{name}': endpoint must be a relative path (e.g. \
                     /api/v1/mcp/{name}/mcp) or omitted; the host is derived from \
                     server.api_external_url. Remove the scheme+host prefix."
            )));
        }
        if self.external_auth.is_some() || self.connector.is_some() || !self.headers.is_empty() {
            return Err(ConfigValidationError::invalid_field(format!(
                "MCP server '{name}': external_auth and headers are only valid on \
                     external servers; internal servers are reached through the gateway \
                     with the systemprompt credential."
            )));
        }
        Ok(())
    }

    fn validate_external(&self, name: &str) -> Result<(), ConfigValidationError> {
        if self
            .endpoint
            .as_deref()
            .is_none_or(|ep| ep.trim().is_empty())
        {
            return Err(ConfigValidationError::invalid_field(format!(
                "MCP server '{name}': external servers require an endpoint."
            )));
        }
        if self.binary.is_some() || self.package.is_some() || self.port.is_some() {
            return Err(ConfigValidationError::invalid_field(format!(
                "MCP server '{name}': binary, package and port are only valid on internal \
                     servers; an external server is reached at its endpoint and is never \
                     bound locally. Remove them."
            )));
        }
        Ok(())
    }

    fn validate_connector(
        &self,
        name: &str,
        connector: &ConnectorConfig,
    ) -> Result<(), ConfigValidationError> {
        if connector.adapter != "generic"
            || !self
                .endpoint
                .as_deref()
                .is_some_and(|endpoint| endpoint.starts_with("https://"))
        {
            return Err(ConfigValidationError::invalid_field(format!(
                "MCP server '{name}': generic connector requires an HTTPS resource"
            )));
        }
        if connector.client_secret.is_some() && connector.client_id_secret.is_none() {
            return Err(ConfigValidationError::invalid_field(format!(
                "MCP server '{name}': connector client secret requires a client ID"
            )));
        }
        connector.validate(name)
    }
}

fn validate_external_auth(name: &str, ext: &ExternalAuth) -> Result<(), ConfigValidationError> {
    if ext.token_endpoint.starts_with("http://") || ext.token_endpoint.starts_with("https://") {
        return Err(ConfigValidationError::invalid_field(format!(
            "MCP server '{name}': external_auth.token_endpoint must be a relative \
                 path (e.g. /api/public/<provider>/token); the host is derived from \
                 server.api_external_url. Remove the scheme+host prefix."
        )));
    }
    if !ext.token_endpoint.starts_with('/') {
        return Err(ConfigValidationError::invalid_field(format!(
            "MCP server '{name}': external_auth.token_endpoint must be an absolute \
                 path beginning with '/'."
        )));
    }
    if ext.header.trim().is_empty() {
        return Err(ConfigValidationError::invalid_field(format!(
            "MCP server '{name}': external_auth.header must not be empty."
        )));
    }
    Ok(())
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SchemaDefinition {
    pub file: String,
    pub table: String,
    pub required_columns: Vec<String>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct OAuthRequirement {
    pub required: bool,
    pub scopes: Vec<Permission>,
    pub audience: JwtAudience,
    pub client_id: Option<ClientId>,
    #[serde(default)]
    pub ema: bool,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Settings {
    pub auto_build: bool,
    pub build_timeout: u64,
    pub health_check_timeout: u64,
    #[serde(default = "default_base_port")]
    pub base_port: u16,
    #[serde(default = "default_working_dir")]
    pub working_dir: String,
}

const fn default_base_port() -> u16 {
    5000
}

fn default_working_dir() -> String {
    "/app".to_owned()
}