| 1 | import * as sdk from '@botpress/sdk';
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| 2 |
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| 3 | type Json = Record<string, any>;
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| 4 |
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| 5 | const rpcResponse = (body: string): Json => {
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| 6 | const candidates = body
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| 7 | .split('\n')
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| 8 | .filter((line) => line.startsWith('data:'))
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| 9 | .map((line) => line.slice(5).trim())
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| 10 | .filter(Boolean);
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| 11 | const raw = candidates.at(-1) ?? body;
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| 12 | try {
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| 13 | return JSON.parse(raw) as Json;
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| 14 | } catch {
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| 15 | throw new sdk.RuntimeError('OpenClasp returned an invalid MCP response');
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| 16 | }
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| 17 | };
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| 18 |
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| 19 | export const callOpenClaspTool = async <T = Json>(
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| 20 | baseUrl: string,
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| 21 | token: string,
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| 22 | name: string,
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| 23 | args: Json = {},
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| 24 | ): Promise<T> => {
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| 25 | if (!token) throw new sdk.RuntimeError('OpenClasp pairing is not complete');
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| 26 | const response = await fetch(`${baseUrl.replace(/\/$/, '')}/mcp`, {
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| 27 | method: 'POST',
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| 28 | headers: {
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| 29 | authorization: `Bearer ${token}`,
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| 30 | accept: 'application/json, text/event-stream',
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| 31 | 'content-type': 'application/json',
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| 32 | 'mcp-protocol-version': '2025-06-18',
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| 33 | },
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| 34 | body: JSON.stringify({
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| 35 | jsonrpc: '2.0',
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| 36 | id: crypto.randomUUID(),
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| 37 | method: 'tools/call',
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| 38 | params: { name, arguments: args },
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| 39 | }),
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| 40 | });
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| 41 | const payload = rpcResponse(await response.text());
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| 42 | if (!response.ok || payload.error)
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| 43 | throw new sdk.RuntimeError(
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| 44 | String(payload.error?.message ?? `OpenClasp MCP HTTP ${response.status}`),
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| 45 | );
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| 46 | const result = payload.result as Json | undefined;
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| 47 | if (result?.isError)
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| 48 | throw new sdk.RuntimeError(String(result.content?.[0]?.text ?? 'OpenClasp tool failed'));
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| 49 | const text = result?.content?.find((item: Json) => item.type === 'text')?.text;
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| 50 | if (typeof text !== 'string') return result as T;
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| 51 | try {
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| 52 | return JSON.parse(text) as T;
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| 53 | } catch {
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| 54 | return text as T;
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| 55 | }
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| 56 | };
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| 57 |
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| 58 | export const sendMcpA2ARequest = async (value: Json): Promise<boolean> => {
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| 59 | const a2a = value.a2a as Json | undefined;
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| 60 | const endpoint = a2a?.endpoint;
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| 61 | const bearerToken = a2a?.bearerToken;
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| 62 | const request = a2a?.request ?? a2a?.requestTemplate;
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| 63 | if (typeof endpoint !== 'string' || typeof bearerToken !== 'string' || !request) return false;
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| 64 | const interactionId =
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| 65 | value.interaction?.interactionId ??
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| 66 | value.plan?.interactionId ??
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| 67 | value.response?.interactionId ??
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| 68 | request.params?.message?.metadata?.interactionId;
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| 69 | const startedAt = Date.now();
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| 70 | const response = await fetch(endpoint, {
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| 71 | method: 'POST',
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| 72 | headers: {
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| 73 | authorization: `Bearer ${bearerToken}`,
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| 74 | 'content-type': 'application/json',
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| 75 | 'A2A-Extensions': 'https://openclasp.dev/extensions/trust/v0.1',
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| 76 | },
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| 77 | body: JSON.stringify({
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| 78 | jsonrpc: '2.0',
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| 79 | id: crypto.randomUUID(),
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| 80 | method: 'message/send',
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| 81 | params: request.params ?? { message: request.message },
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| 82 | }),
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| 83 | });
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| 84 | console.info('[openclasp-a2a]', {
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| 85 | event: 'mcp_a2a_request.completed',
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| 86 | interactionId,
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| 87 | statusCode: response.status,
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| 88 | durationMs: Date.now() - startedAt,
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| 89 | });
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| 90 | if (!response.ok)
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| 91 | throw new sdk.RuntimeError(`Peer A2A endpoint returned HTTP ${response.status}`);
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| 92 | return true;
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| 93 | };
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