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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+
+interface nsIInputStream;
+interface nsIFile;
+interface nsIOutputStream;
+interface nsISimpleEnumerator;
+
+interface nsIHttpServer;
+interface nsIHttpServerStoppedCallback;
+interface nsIHttpRequestHandler;
+interface nsIHttpRequest;
+interface nsIHttpResponse;
+interface nsIHttpServerIdentity;
+
+/**
+ * An interface which represents an HTTP server.
+ */
+[scriptable, uuid(cea8812e-faa6-4013-9396-f9936cbb74ec)]
+interface nsIHttpServer : nsISupports
+{
+ /**
+ * Starts up this server, listening upon the given port.
+ *
+ * @param port
+ * the port upon which listening should happen, or -1 if no specific port is
+ * desired
+ * @throws NS_ERROR_ALREADY_INITIALIZED
+ * if this server is already started
+ * @throws NS_ERROR_NOT_AVAILABLE
+ * if the server is not started and cannot be started on the desired port
+ * (perhaps because the port is already in use or because the process does
+ * not have privileges to do so)
+ * @note
+ * Behavior is undefined if this method is called after stop() has been
+ * called on this but before the provided callback function has been
+ * called.
+ */
+ void start(in long port);
+
+ /**
+ * Shuts down this server if it is running (including the period of time after
+ * stop() has been called but before the provided callback has been called).
+ *
+ * @param callback
+ * an asynchronous callback used to notify the user when this server is
+ * stopped and all pending requests have been fully served
+ * @throws NS_ERROR_NULL_POINTER
+ * if callback is null
+ * @throws NS_ERROR_UNEXPECTED
+ * if this server is not running
+ */
+ void stop(in nsIHttpServerStoppedCallback callback);
+
+ /**
+ * Associates the local file represented by the string file with all requests
+ * which match request.
+ *
+ * @param path
+ * the path which is to be mapped to the given file; must begin with "/" and
+ * be a valid URI path (i.e., no query string, hash reference, etc.)
+ * @param file
+ * the file to serve for the given path, or null to remove any mapping that
+ * might exist; this file must exist for the lifetime of the server
+ */
+ void registerFile(in string path, in nsIFile file);
+
+ /**
+ * Registers a custom path handler.
+ *
+ * @param path
+ * the path on the server (beginning with a "/") which is to be handled by
+ * handler; this path must not include a query string or hash component; it
+ * also should usually be canonicalized, since most browsers will do so
+ * before sending otherwise-matching requests
+ * @param handler
+ * an object which will handle any requests for the given path, or null to
+ * remove any existing handler; if while the server is running the handler
+ * throws an exception while responding to a request, an HTTP 500 response
+ * will be returned
+ * @throws NS_ERROR_INVALID_ARG
+ * if path does not begin with a "/"
+ */
+ void registerPathHandler(in string path, in nsIHttpRequestHandler handler);
+
+ /**
+ * Registers a custom prefix handler.
+ *
+ * @param prefix
+ * the path on the server (beginning and ending with "/") which is to be
+ * handled by handler; this path must not include a query string or hash
+ * component. All requests that start with this prefix will be directed to
+ * the given handler.
+ * @param handler
+ * an object which will handle any requests for the given path, or null to
+ * remove any existing handler; if while the server is running the handler
+ * throws an exception while responding to a request, an HTTP 500 response
+ * will be returned
+ * @throws NS_ERROR_INVALID_ARG
+ * if path does not begin with a "/" or does not end with a "/"
+ */
+ void registerPrefixHandler(in string prefix, in nsIHttpRequestHandler handler);
+
+ /**
+ * Registers a custom error page handler.
+ *
+ * @param code
+ * the error code which is to be handled by handler
+ * @param handler
+ * an object which will handle any requests which generate the given status
+ * code, or null to remove any existing handler. If the handler throws an
+ * exception during server operation, fallback is to the genericized error
+ * handler (the x00 version), then to 500, using a user-defined error
+ * handler if one exists or the server default handler otherwise. Fallback
+ * will never occur from a user-provided handler that throws to the same
+ * handler as provided by the server, e.g. a throwing user 404 falls back to
+ * 400, not a server-provided 404 that might not throw.
+ * @note
+ * If the error handler handles HTTP 500 and throws, behavior is undefined.
+ */
+ void registerErrorHandler(in unsigned long code, in nsIHttpRequestHandler handler);
+
+ /**
+ * Maps all requests to paths beneath path to the corresponding file beneath
+ * dir.
+ *
+ * @param path
+ * the absolute path on the server against which requests will be served
+ * from dir (e.g., "/", "/foo/", etc.); must begin and end with a forward
+ * slash
+ * @param dir
+ * the directory to be used to serve all requests for paths underneath path
+ * (except those further overridden by another, deeper path registered with
+ * another directory); if null, any current mapping for the given path is
+ * removed
+ * @throws NS_ERROR_INVALID_ARG
+ * if dir is non-null and does not exist or is not a directory, or if path
+ * does not begin with and end with a forward slash
+ */
+ void registerDirectory(in string path, in nsIFile dir);
+
+ /**
+ * Associates files with the given extension with the given Content-Type when
+ * served by this server, in the absence of any file-specific information
+ * about the desired Content-Type. If type is empty, removes any extant
+ * mapping, if one is present.
+ *
+ * @throws NS_ERROR_INVALID_ARG
+ * if the given type is not a valid header field value, i.e. if it doesn't
+ * match the field-value production in RFC 2616
+ * @note
+ * No syntax checking is done of the given type, beyond ensuring that it is
+ * a valid header field value. Behavior when not given a string matching
+ * the media-type production in RFC 2616 section 3.7 is undefined.
+ * Implementations may choose to define specific behavior for types which do
+ * not match the production, such as for CGI functionality.
+ * @note
+ * Implementations MAY treat type as a trusted argument; users who fail to
+ * generate this string from trusted data risk security vulnerabilities.
+ */
+ void registerContentType(in string extension, in string type);
+
+ /**
+ * Sets the handler used to display the contents of a directory if
+ * the directory contains no index page.
+ *
+ * @param handler
+ * an object which will handle any requests for directories which
+ * do not contain index pages, or null to reset to the default
+ * index handler; if while the server is running the handler
+ * throws an exception while responding to a request, an HTTP 500
+ * response will be returned. An nsIFile corresponding to the
+ * directory is available from the metadata object passed to the
+ * handler, under the key "directory".
+ */
+ void setIndexHandler(in nsIHttpRequestHandler handler);
+
+ /** Represents the locations at which this server is reachable. */
+ readonly attribute nsIHttpServerIdentity identity;
+
+ /**
+ * Retrieves the string associated with the given key in this, for the given
+ * path's saved state. All keys are initially associated with the empty
+ * string.
+ */
+ AString getState(in AString path, in AString key);
+
+ /**
+ * Sets the string associated with the given key in this, for the given path's
+ * saved state.
+ */
+ void setState(in AString path, in AString key, in AString value);
+
+ /**
+ * Retrieves the string associated with the given key in this, in
+ * entire-server saved state. All keys are initially associated with the
+ * empty string.
+ */
+ AString getSharedState(in AString key);
+
+ /**
+ * Sets the string associated with the given key in this, in entire-server
+ * saved state.
+ */
+ void setSharedState(in AString key, in AString value);
+
+ /**
+ * Retrieves the object associated with the given key in this in
+ * object-valued saved state. All keys are initially associated with null.
+ */
+ nsISupports getObjectState(in AString key);
+
+ /**
+ * Sets the object associated with the given key in this in object-valued
+ * saved state. The value may be null.
+ */
+ void setObjectState(in AString key, in nsISupports value);
+};
+
+/**
+ * An interface through which a notification of the complete stopping (socket
+ * closure, in-flight requests all fully served and responded to) of an HTTP
+ * server may be received.
+ */
+[scriptable, function, uuid(925a6d33-9937-4c63-abe1-a1c56a986455)]
+interface nsIHttpServerStoppedCallback : nsISupports
+{
+ /** Called when the corresponding server has been fully stopped. */
+ void onStopped();
+};
+
+/**
+ * Represents a set of names for a server, one of which is the primary name for
+ * the server and the rest of which are secondary. By default every server will
+ * contain ("http", "localhost", port) and ("http", "127.0.0.1", port) as names,
+ * where port is what was provided to the corresponding server when started;
+ * however, except for their being removed when the corresponding server stops
+ * they have no special importance.
+ */
+[scriptable, uuid(a89de175-ae8e-4c46-91a5-0dba99bbd284)]
+interface nsIHttpServerIdentity : nsISupports
+{
+ /**
+ * The primary scheme at which the corresponding server is located, defaulting
+ * to 'http'. This name will be the value of nsIHttpRequest.scheme for
+ * HTTP/1.0 requests.
+ *
+ * This value is always set when the corresponding server is running. If the
+ * server is not running, this value is set only if it has been set to a
+ * non-default name using setPrimary. In this case reading this value will
+ * throw NS_ERROR_NOT_INITIALIZED.
+ */
+ readonly attribute string primaryScheme;
+
+ /**
+ * The primary name by which the corresponding server is known, defaulting to
+ * 'localhost'. This name will be the value of nsIHttpRequest.host for
+ * HTTP/1.0 requests.
+ *
+ * This value is always set when the corresponding server is running. If the
+ * server is not running, this value is set only if it has been set to a
+ * non-default name using setPrimary. In this case reading this value will
+ * throw NS_ERROR_NOT_INITIALIZED.
+ */
+ readonly attribute string primaryHost;
+
+ /**
+ * The primary port on which the corresponding server runs, defaulting to the
+ * associated server's port. This name will be the value of
+ * nsIHttpRequest.port for HTTP/1.0 requests.
+ *
+ * This value is always set when the corresponding server is running. If the
+ * server is not running, this value is set only if it has been set to a
+ * non-default name using setPrimary. In this case reading this value will
+ * throw NS_ERROR_NOT_INITIALIZED.
+ */
+ readonly attribute long primaryPort;
+
+ /**
+ * Adds a location at which this server may be accessed.
+ *
+ * @throws NS_ERROR_ILLEGAL_VALUE
+ * if scheme or host do not match the scheme or host productions imported
+ * into RFC 2616 from RFC 2396, or if port is not a valid port number
+ */
+ void add(in string scheme, in string host, in long port);
+
+ /**
+ * Removes this name from the list of names by which the corresponding server
+ * is known. If name is also the primary name for the server, the primary
+ * name reverts to 'http://127.0.0.1' with the associated server's port.
+ *
+ * @throws NS_ERROR_ILLEGAL_VALUE
+ * if scheme or host do not match the scheme or host productions imported
+ * into RFC 2616 from RFC 2396, or if port is not a valid port number
+ * @returns
+ * true if the given name was a name for this server, false otherwise
+ */
+ boolean remove(in string scheme, in string host, in long port);
+
+ /**
+ * Returns true if the given name is in this, false otherwise.
+ *
+ * @throws NS_ERROR_ILLEGAL_VALUE
+ * if scheme or host do not match the scheme or host productions imported
+ * into RFC 2616 from RFC 2396, or if port is not a valid port number
+ */
+ boolean has(in string scheme, in string host, in long port);
+
+ /**
+ * Returns the scheme for the name with the given host and port, if one is
+ * present; otherwise returns the empty string.
+ *
+ * @throws NS_ERROR_ILLEGAL_VALUE
+ * if host does not match the host production imported into RFC 2616 from
+ * RFC 2396, or if port is not a valid port number
+ */
+ string getScheme(in string host, in long port);
+
+ /**
+ * Designates the given name as the primary name in this and adds it to this
+ * if it is not already present.
+ *
+ * @throws NS_ERROR_ILLEGAL_VALUE
+ * if scheme or host do not match the scheme or host productions imported
+ * into RFC 2616 from RFC 2396, or if port is not a valid port number
+ */
+ void setPrimary(in string scheme, in string host, in long port);
+};
+
+/**
+ * A representation of a handler for HTTP requests. The handler is used by
+ * calling its .handle method with data for an incoming request; it is the
+ * handler's job to use that data as it sees fit to make the desired response.
+ *
+ * @note
+ * This interface uses the [function] attribute, so you can pass a
+ * script-defined function with the functionality of handle() to any
+ * method which has a nsIHttpRequestHandler parameter, instead of wrapping
+ * it in an otherwise empty object.
+ */
+[scriptable, function, uuid(2bbb4db7-d285-42b3-a3ce-142b8cc7e139)]
+interface nsIHttpRequestHandler : nsISupports
+{
+ /**
+ * Processes an HTTP request and initializes the passed-in response to reflect
+ * the correct HTTP response.
+ *
+ * If this method throws an exception, externally observable behavior depends
+ * upon whether is being processed asynchronously. If such is the case, the
+ * output is some prefix (perhaps all, perhaps none, perhaps only some) of the
+ * data which would have been sent if, instead, the response had been finished
+ * at that point. If no data has been written, the response has not had
+ * seizePower() called on it, and it is not being asynchronously created, an
+ * error handler will be invoked (usually 500 unless otherwise specified).
+ *
+ * Some uses of nsIHttpRequestHandler may require this method to never throw
+ * an exception; in the general case, however, this method may throw an
+ * exception (causing an HTTP 500 response to occur, if the above conditions
+ * are met).
+ *
+ * @param request
+ * data representing an HTTP request
+ * @param response
+ * an initially-empty response which must be modified to reflect the data
+ * which should be sent as the response to the request described by metadata
+ */
+ void handle(in nsIHttpRequest request, in nsIHttpResponse response);
+};
+
+
+/**
+ * A representation of the data included in an HTTP request.
+ */
+[scriptable, uuid(978cf30e-ad73-42ee-8f22-fe0aaf1bf5d2)]
+interface nsIHttpRequest : nsISupports
+{
+ /**
+ * The request type for this request (see RFC 2616, section 5.1.1).
+ */
+ readonly attribute string method;
+
+ /**
+ * The scheme of the requested path, usually 'http' but might possibly be
+ * 'https' if some form of SSL tunneling is in use. Note that this value
+ * cannot be accurately determined unless the incoming request used the
+ * absolute-path form of the request line; it defaults to 'http', so only
+ * if it is something else can you be entirely certain it's correct.
+ */
+ readonly attribute string scheme;
+
+ /**
+ * The host of the data being requested (e.g. "localhost" for the
+ * http://localhost:8080/file resource). Note that the relevant port on the
+ * host is specified in this.port. This value is in the ASCII character
+ * encoding.
+ */
+ readonly attribute string host;
+
+ /**
+ * The port on the server on which the request was received.
+ */
+ readonly attribute unsigned long port;
+
+ /**
+ * The requested path, without any query string (e.g. "/dir/file.txt"). It is
+ * guaranteed to begin with a "/". The individual components in this string
+ * are URL-encoded.
+ */
+ readonly attribute string path;
+
+ /**
+ * The URL-encoded query string associated with this request, not including
+ * the initial "?", or "" if no query string was present.
+ */
+ readonly attribute string queryString;
+
+ /**
+ * A string containing the HTTP version of the request (i.e., "1.1"). Leading
+ * zeros for either component of the version will be omitted. (In other
+ * words, if the request contains the version "1.01", this attribute will be
+ * "1.1"; see RFC 2616, section 3.1.)
+ */
+ readonly attribute string httpVersion;
+
+ /**
+ * Returns the value for the header in this request specified by fieldName.
+ *
+ * @param fieldName
+ * the name of the field whose value is to be gotten; note that since HTTP
+ * header field names are case-insensitive, this method produces equivalent
+ * results for "HeAdER" and "hEADer" as fieldName
+ * @returns
+ * The result is a string containing the individual values of the header,
+ * usually separated with a comma. The headers WWW-Authenticate,
+ * Proxy-Authenticate, and Set-Cookie violate the HTTP specification,
+ * however, and for these headers only the separator string is '\n'.
+ *
+ * @throws NS_ERROR_INVALID_ARG
+ * if fieldName does not constitute a valid header field name
+ * @throws NS_ERROR_NOT_AVAILABLE
+ * if the given header does not exist in this
+ */
+ string getHeader(in string fieldName);
+
+ /**
+ * Returns true if a header with the given field name exists in this, false
+ * otherwise.
+ *
+ * @param fieldName
+ * the field name whose existence is to be determined in this; note that
+ * since HTTP header field names are case-insensitive, this method produces
+ * equivalent results for "HeAdER" and "hEADer" as fieldName
+ * @throws NS_ERROR_INVALID_ARG
+ * if fieldName does not constitute a valid header field name
+ */
+ boolean hasHeader(in string fieldName);
+
+ /**
+ * An nsISimpleEnumerator of nsISupportsStrings over the names of the headers
+ * in this request. The header field names in the enumerator may not
+ * necessarily have the same case as they do in the request itself.
+ */
+ readonly attribute nsISimpleEnumerator headers;
+
+ /**
+ * A stream from which data appearing in the body of this request can be read.
+ */
+ readonly attribute nsIInputStream bodyInputStream;
+};
+
+
+/**
+ * Represents an HTTP response, as described in RFC 2616, section 6.
+ */
+[scriptable, uuid(1acd16c2-dc59-42fa-9160-4f26c43c1c21)]
+interface nsIHttpResponse : nsISupports
+{
+ /**
+ * Sets the status line for this. If this method is never called on this, the
+ * status line defaults to "HTTP/", followed by the server's default HTTP
+ * version (e.g. "1.1"), followed by " 200 OK".
+ *
+ * @param httpVersion
+ * the HTTP version of this, as a string (e.g. "1.1"); if null, the server
+ * default is used
+ * @param code
+ * the numeric HTTP status code for this
+ * @param description
+ * a human-readable description of code; may be null if no description is
+ * desired
+ * @throws NS_ERROR_INVALID_ARG
+ * if httpVersion is not a valid HTTP version string, statusCode is greater
+ * than 999, or description contains invalid characters
+ * @throws NS_ERROR_NOT_AVAILABLE
+ * if this response is being processed asynchronously and data has been
+ * written to this response's body, or if seizePower() has been called on
+ * this
+ */
+ void setStatusLine(in string httpVersion,
+ in unsigned short statusCode,
+ in string description);
+
+ /**
+ * Sets the specified header in this.
+ *
+ * @param name
+ * the name of the header; must match the field-name production per RFC 2616
+ * @param value
+ * the value of the header; must match the field-value production per RFC
+ * 2616
+ * @param merge
+ * when true, if the given header already exists in this, the values passed
+ * to this function will be merged into the existing header, per RFC 2616
+ * header semantics (except for the Set-Cookie, WWW-Authenticate, and
+ * Proxy-Authenticate headers, which will treat each such merged header as
+ * an additional instance of the header, for real-world compatibility
+ * reasons); when false, replaces any existing header of the given name (if
+ * any exists) with a new header with the specified value
+ * @throws NS_ERROR_INVALID_ARG
+ * if name or value is not a valid header component
+ * @throws NS_ERROR_NOT_AVAILABLE
+ * if this response is being processed asynchronously and data has been
+ * written to this response's body, or if seizePower() has been called on
+ * this
+ */
+ void setHeader(in string name, in string value, in boolean merge);
+
+ /**
+ * This is used for testing our header handling, so header will be sent out
+ * without transformation. There can be multiple headers.
+ */
+ void setHeaderNoCheck(in string name, in string value);
+
+ /**
+ * A stream to which data appearing in the body of this response (or in the
+ * totality of the response if seizePower() is called) should be written.
+ * After this response has been designated as being processed asynchronously,
+ * or after seizePower() has been called on this, subsequent writes will no
+ * longer be buffered and will be written to the underlying transport without
+ * delaying until the entire response is constructed. Write-through may or
+ * may not be synchronous in the implementation, and in any case particular
+ * behavior may not be observable to the HTTP client as intermediate buffers
+ * both in the server socket and in the client may delay written data; be
+ * prepared for delays at any time.
+ *
+ * @throws NS_ERROR_NOT_AVAILABLE
+ * if accessed after this response is fully constructed
+ */
+ readonly attribute nsIOutputStream bodyOutputStream;
+
+ /**
+ * Writes a string to the response's output stream. This method is merely a
+ * convenient shorthand for writing the same data to bodyOutputStream
+ * directly.
+ *
+ * @note
+ * This method is only guaranteed to work with ASCII data.
+ * @throws NS_ERROR_NOT_AVAILABLE
+ * if called after this response has been fully constructed
+ */
+ void write(in string data);
+
+ /**
+ * Signals that this response is being constructed asynchronously. Requests
+ * are typically completely constructed during nsIHttpRequestHandler.handle;
+ * however, responses which require significant resources (time, memory,
+ * processing) to construct can be created and sent incrementally by calling
+ * this method during the call to nsIHttpRequestHandler.handle. This method
+ * only has this effect when called during nsIHttpRequestHandler.handle;
+ * behavior is undefined if it is called at a later time. It may be called
+ * multiple times with no ill effect, so long as each call occurs before
+ * finish() is called.
+ *
+ * @throws NS_ERROR_UNEXPECTED
+ * if not initially called within a nsIHttpRequestHandler.handle call or if
+ * called after this response has been finished
+ * @throws NS_ERROR_NOT_AVAILABLE
+ * if seizePower() has been called on this
+ */
+ void processAsync();
+
+ /**
+ * Seizes complete control of this response (and its connection) from the
+ * server, allowing raw and unfettered access to data being sent in the HTTP
+ * response. Once this method has been called the only property which may be
+ * accessed without an exception being thrown is bodyOutputStream, and the
+ * only methods which may be accessed without an exception being thrown are
+ * write(), finish(), and seizePower() (which may be called multiple times
+ * without ill effect so long as all calls are otherwise allowed).
+ *
+ * After a successful call, all data subsequently written to the body of this
+ * response is written directly to the corresponding connection. (Previously-
+ * written data is silently discarded.) No status line or headers are sent
+ * before doing so; if the response handler wishes to write such data, it must
+ * do so manually. Data generation completes only when finish() is called; it
+ * is not enough to simply call close() on bodyOutputStream.
+ *
+ * @throws NS_ERROR_NOT_AVAILABLE
+ * if processAsync() has been called on this
+ * @throws NS_ERROR_UNEXPECTED
+ * if finish() has been called on this
+ */
+ void seizePower();
+
+ /**
+ * Signals that construction of this response is complete and that it may be
+ * sent over the network to the client, or if seizePower() has been called
+ * signals that all data has been written and that the underlying connection
+ * may be closed. This method may only be called after processAsync() or
+ * seizePower() has been called. This method is idempotent.
+ *
+ * @throws NS_ERROR_UNEXPECTED
+ * if processAsync() or seizePower() has not already been properly called
+ */
+ void finish();
+};