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<h1><a href="../../index.html">All files</a> / <a href="index.html">src/utils</a> capability-negotiation.ts</h1>
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js"><span class="cstat-no" title="statement not covered" >import { ServerCapabilities, ClientCapabilities, NegotiatedCapabilities, DEFAULT_SERVER_CAPABILITIES } from '../types/capabilities';</span>
<span class="cstat-no" title="statement not covered" >import { StructuredError } from '../types/errors';</span>
/**
* Check if protocol versions are compatible
* @param serverVersion Server protocol version
* @param clientVersion Client protocol version
* @returns True if versions are compatible
*/
function <span class="fstat-no" title="function not covered" >areVersionsCompatible(</span>serverVersion: string, clientVersion: string): boolean {
// For now, versions must match exactly. In the future, we can implement semver comparison
<span class="cstat-no" title="statement not covered" > return serverVersion === clientVersion;</span>
}
/**
* Negotiate capabilities between server and client
* @param clientCapabilities Optional client capabilities to negotiate with
* @returns Negotiated capabilities
* @throws {StructuredError} If protocol versions are incompatible
*/
<span class="cstat-no" title="statement not covered" >export function <span class="fstat-no" title="function not covered" >n</span>egotiateCapabilities(</span>clientCapabilities?: ClientCapabilities): NegotiatedCapabilities {
// Start with protocol version
const negotiatedCapabilities: NegotiatedCapabilities = <span class="cstat-no" title="statement not covered" >{</span>
protocolVersion: DEFAULT_SERVER_CAPABILITIES.protocolVersion
};
// If no client capabilities provided, copy server defaults
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (!clientCapabilities) {</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (DEFAULT_SERVER_CAPABILITIES.tools) {</span>
<span class="cstat-no" title="statement not covered" > negotiatedCapabilities.tools = { ...DEFAULT_SERVER_CAPABILITIES.tools };</span>
}
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (DEFAULT_SERVER_CAPABILITIES.resources) {</span>
<span class="cstat-no" title="statement not covered" > negotiatedCapabilities.resources = { ...DEFAULT_SERVER_CAPABILITIES.resources };</span>
}
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (DEFAULT_SERVER_CAPABILITIES.prompts) {</span>
<span class="cstat-no" title="statement not covered" > negotiatedCapabilities.prompts = { ...DEFAULT_SERVER_CAPABILITIES.prompts };</span>
}
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (DEFAULT_SERVER_CAPABILITIES.logging) {</span>
<span class="cstat-no" title="statement not covered" > negotiatedCapabilities.logging = { ...DEFAULT_SERVER_CAPABILITIES.logging };</span>
}
<span class="cstat-no" title="statement not covered" > return negotiatedCapabilities;</span>
}
// Check protocol version compatibility
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (!areVersionsCompatible(DEFAULT_SERVER_CAPABILITIES.protocolVersion, clientCapabilities.protocolVersion)) {</span>
<span class="cstat-no" title="statement not covered" > throw new StructuredError({</span>
code: 'INCOMPATIBLE_PROTOCOL_VERSION',
message: `Protocol version mismatch. Server: ${DEFAULT_SERVER_CAPABILITIES.protocolVersion}, Client: ${clientCapabilities.protocolVersion}`,
data: {
serverVersion: DEFAULT_SERVER_CAPABILITIES.protocolVersion,
clientVersion: clientCapabilities.protocolVersion
}
});
}
// Negotiate tools capabilities
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (DEFAULT_SERVER_CAPABILITIES.tools) {</span>
<span class="cstat-no" title="statement not covered" > negotiatedCapabilities.tools = {</span>
call: clientCapabilities.tools?.call ?? DEFAULT_SERVER_CAPABILITIES.tools.call ?? false,
list: clientCapabilities.tools?.list ?? DEFAULT_SERVER_CAPABILITIES.tools.list ?? false,
listChanged: clientCapabilities.tools?.listChanged ?? DEFAULT_SERVER_CAPABILITIES.tools.listChanged ?? false,
subscribe: clientCapabilities.tools?.subscribe ?? DEFAULT_SERVER_CAPABILITIES.tools.subscribe ?? false
};
}
// Negotiate resources capabilities
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (DEFAULT_SERVER_CAPABILITIES.resources) {</span>
<span class="cstat-no" title="statement not covered" > negotiatedCapabilities.resources = {</span>
get: clientCapabilities.resources?.get ?? DEFAULT_SERVER_CAPABILITIES.resources.get ?? false,
put: clientCapabilities.resources?.put ?? DEFAULT_SERVER_CAPABILITIES.resources.put ?? false,
delete: clientCapabilities.resources?.delete ?? DEFAULT_SERVER_CAPABILITIES.resources.delete ?? false,
listChanged: clientCapabilities.resources?.listChanged ?? DEFAULT_SERVER_CAPABILITIES.resources.listChanged ?? false,
subscribe: clientCapabilities.resources?.subscribe ?? DEFAULT_SERVER_CAPABILITIES.resources.subscribe ?? false
};
}
// Negotiate prompts capabilities
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (DEFAULT_SERVER_CAPABILITIES.prompts) {</span>
<span class="cstat-no" title="statement not covered" > negotiatedCapabilities.prompts = {</span>
get: clientCapabilities.prompts?.get ?? DEFAULT_SERVER_CAPABILITIES.prompts.get ?? false,
list: clientCapabilities.prompts?.list ?? DEFAULT_SERVER_CAPABILITIES.prompts.list ?? false,
listChanged: clientCapabilities.prompts?.listChanged ?? DEFAULT_SERVER_CAPABILITIES.prompts.listChanged ?? false,
subscribe: clientCapabilities.prompts?.subscribe ?? DEFAULT_SERVER_CAPABILITIES.prompts.subscribe ?? false
};
}
// Negotiate logging capabilities
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (DEFAULT_SERVER_CAPABILITIES.logging) {</span>
<span class="cstat-no" title="statement not covered" > negotiatedCapabilities.logging = {</span>
level: clientCapabilities.logging?.level ?? DEFAULT_SERVER_CAPABILITIES.logging.level ?? 'info',
subscribe: clientCapabilities.logging?.subscribe ?? DEFAULT_SERVER_CAPABILITIES.logging.subscribe ?? false
};
}
<span class="cstat-no" title="statement not covered" > return negotiatedCapabilities;</span>
}
/**
* Validate client capabilities against server capabilities
* @param capabilities Client capabilities to validate
* @returns True if capabilities are valid, false otherwise
*/
<span class="cstat-no" title="statement not covered" >export function <span class="fstat-no" title="function not covered" >v</span>alidateClientCapabilities(</span>capabilities: unknown): capabilities is ClientCapabilities {
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (!capabilities || typeof capabilities !== 'object') {</span>
<span class="cstat-no" title="statement not covered" > return false;</span>
}
const capObj = <span class="cstat-no" title="statement not covered" >capabilities as Record<string, unknown>;</span>
// Check for unknown capability categories
const validCategories = <span class="cstat-no" title="statement not covered" >['tools', 'resources', 'prompts', 'logging'];</span>
const hasInvalidCategory = <span class="cstat-no" title="statement not covered" >Object.keys(capObj).some(<span class="fstat-no" title="function not covered" >key </span>=> <span class="cstat-no" title="statement not covered" >!validCategories.includes(key))</span>;</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (hasInvalidCategory) {</span>
<span class="cstat-no" title="statement not covered" > return false;</span>
}
// Validate tools capabilities
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (capObj.tools && typeof capObj.tools !== 'object') {</span>
<span class="cstat-no" title="statement not covered" > return false;</span>
}
// Validate resources capabilities
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (capObj.resources && typeof capObj.resources !== 'object') {</span>
<span class="cstat-no" title="statement not covered" > return false;</span>
}
// Validate prompts capabilities
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (capObj.prompts && typeof capObj.prompts !== 'object') {</span>
<span class="cstat-no" title="statement not covered" > return false;</span>
}
// Validate logging capabilities
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (capObj.logging) {</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (typeof capObj.logging !== 'object') {</span>
<span class="cstat-no" title="statement not covered" > return false;</span>
}
const logging = <span class="cstat-no" title="statement not covered" >capObj.logging as Record<string, unknown>;</span>
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (logging.level && !['debug', 'info', 'warn', 'error'].includes(logging.level as string)) {</span>
<span class="cstat-no" title="statement not covered" > return false;</span>
}
}
<span class="cstat-no" title="statement not covered" > return true;</span>
} </pre></td></tr></table></pre>
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