Create type definition for 'http-signature' (#4049)

* Create type definition for 'http-signature'

* Follow lint

src/@types/http-signature.d.ts

@@ -0,0 +1,75 @@
+declare module 'http-signature' {
+	import { IncomingMessage, ClientRequest } from 'http';
+
+	interface ISignature {
+		keyId: string;
+		algorithm: string;
+		headers: string[];
+		signature: string;
+	}
+
+	interface IOptions {
+		headers?: string[];
+		algorithm?: string;
+		strict?: boolean;
+		authorizationHeaderName?: string;
+	}
+
+	interface IParseRequestOptions extends IOptions {
+		clockSkew?: number;
+	}
+
+	interface IParsedSignature  {
+		scheme: string;
+		params: ISignature;
+		signingString: string;
+	}
+
+	type RequestSignerConstructorOptions =
+		IRequestSignerConstructorOptionsFromProperties |
+		IRequestSignerConstructorOptionsFromFunction;
+
+	interface IRequestSignerConstructorOptionsFromProperties {
+		keyId: string;
+		key: string | Buffer;
+		algorithm?: string;
+	}
+
+	interface IRequestSignerConstructorOptionsFromFunction {
+		sign?: (data: string, cb: (err: any, sig: ISignature) => void) => void;
+	}
+
+	class RequestSigner {
+		constructor(options: RequestSignerConstructorOptions);
+
+		public writeHeader(header: string, value: string): string;
+
+		public writeDateHeader(): string;
+
+		public writeTarget(method: string, path: string): void;
+
+		public sign(cb: (err: any, authz: string) => void): void;
+	}
+
+	interface ISignRequestOptions extends IOptions {
+		keyId: string;
+		key: string;
+		httpVersion?: string;
+	}
+
+	export function parse(request: IncomingMessage, options?: IParseRequestOptions): IParsedSignature;
+	export function parseRequest(request: IncomingMessage, options?: IParseRequestOptions): IParsedSignature;
+
+	export function sign(request: ClientRequest, options: ISignRequestOptions): boolean;
+	export function signRequest(request: ClientRequest, options: ISignRequestOptions): boolean;
+	export function createSigner(): RequestSigner;
+	export function isSigner(obj: any): obj is RequestSigner;
+
+	export function sshKeyToPEM(key: string): string;
+	export function sshKeyFingerprint(key: string): string;
+	export function pemToRsaSSHKey(pem: string, comment: string): string;
+
+	export function verify(parsedSignature: IParsedSignature, pubkey: string | Buffer): boolean;
+	export function verifySignature(parsedSignature: IParsedSignature, pubkey: string | Buffer): boolean;
+	export function verifyHMAC(parsedSignature: IParsedSignature, secret: string): boolean;
+}