-(defun elpher-process-gemini-response (renderer)
- "Process the gemini response and pass the result to RENDERER.
-The response is assumed to be in the variable `elpher-gemini-response'."
- (condition-case the-error
- (let* ((response-header (car (split-string elpher-gemini-response "\r\n")))
- (response-body (substring elpher-gemini-response
- (+ (string-match "\r\n" elpher-gemini-response) 2)))
- (response-code (car (split-string response-header)))
- (response-meta (string-trim
- (substring response-header
- (string-match "[ \t]+" response-header)))))
- (pcase (elt response-code 0)
- (?1 ; Input required
- (elpher-with-clean-buffer
- (insert "Gemini server is requesting input."))
- (let* ((query-string (read-string (concat response-meta ": ")))
- (url (elpher-address-to-url (elpher-node-address elpher-current-node)))
- (query-address (elpher-address-from-url (concat url "?" query-string))))
- (elpher-get-gemini-response query-address
- (lambda (_proc event)
- (unless (string-prefix-p "deleted" event)
- (funcall #'elpher-process-gemini-response
- renderer)
- (elpher-restore-pos))))))
- (?2 ; Normal response
- ;; (message response-header)
- (funcall renderer response-body response-meta))
- (?3 ; Redirect
- (message "Following redirect to %s" response-meta)
- (let ((redirect-address (elpher-address-from-gemini-url response-meta)))
- (elpher-get-gemini-response redirect-address
- (lambda (_proc event)
- (unless (string-prefix-p "deleted" event)
- (funcall #'elpher-process-gemini-response
- renderer)
- (elpher-restore-pos))))))
- (?4 ; Temporary failure
- (error "Gemini server reports TEMPORARY FAILURE for this request: %S"
- response-header))
- (?5 ; Permanent failure
- (error "Gemini server reports PERMANENT FAILURE for this request: %S"
- response-header))
- (?6 ; Client certificate required
- (error "Gemini server requires client certificate (unsupported at this time)"))
- (_other
- (error "Gemini server response unknown: %S"
- response-header))))
- (error
- (elpher-network-error (elpher-node-address elpher-current-node) the-error))))
+(defun elpher-parse-gemini-response (response)
+ "Parse the RESPONSE string and return a list of components.
+The list is of the form (code meta body). A response of nil implies
+that the response was malformed."
+ (let ((header-end-idx (string-match "\r\n" response)))
+ (if header-end-idx
+ (let ((header (string-trim (substring response 0 header-end-idx)))
+ (body (substring response (+ header-end-idx 2))))
+ (if (>= (length header) 2)
+ (let ((code (substring header 0 2))
+ (meta (string-trim (substring header 2))))
+ (list code meta body))
+ (error "Malformed response: No response status found in header %s" header)))
+ (error "Malformed response: No CRLF-delimited header found"))))
+
+(defun elpher-process-gemini-response (response-string renderer)
+ "Process the gemini response RESPONSE-STRING and pass the result to RENDERER."
+ (let ((response-components (elpher-parse-gemini-response response-string)))
+ (let ((response-code (elt response-components 0))
+ (response-meta (elt response-components 1))
+ (response-body (elt response-components 2)))
+ (pcase (elt response-code 0)
+ (?1 ; Input required
+ (elpher-with-clean-buffer
+ (insert "Gemini server is requesting input."))
+ (let* ((query-string (read-string (concat response-meta ": ")))
+ (url (elpher-address-to-url (elpher-node-address elpher-current-node)))
+ (query-address (elpher-address-from-url (concat url "?" query-string))))
+ (elpher-get-gemini-response query-address renderer)))
+ (?2 ; Normal response
+ (funcall renderer response-body response-meta))
+ (?3 ; Redirect
+ (message "Following redirect to %s" response-meta)
+ (if (>= (length elpher-gemini-redirect-chain) 5)
+ (error "More than 5 consecutive redirects followed"))
+ (let ((redirect-address (elpher-address-from-gemini-url response-meta)))
+ (if (member redirect-address elpher-gemini-redirect-chain)
+ (error "Redirect loop detected"))
+ (if (not (string= (elpher-address-protocol redirect-address)
+ "gemini"))
+ (error "Server tried to automatically redirect to non-gemini URL: %s"
+ response-meta))
+ (add-to-list 'elpher-gemini-redirect-chain redirect-address)
+ (elpher-get-gemini-response redirect-address renderer)))
+ (?4 ; Temporary failure
+ (error "Gemini server reports TEMPORARY FAILURE for this request: %s %s"
+ response-code response-meta))
+ (?5 ; Permanent failure
+ (error "Gemini server reports PERMANENT FAILURE for this request: %s %s"
+ response-code response-meta))
+ (?6 ; Client certificate required
+ (error "Gemini server requires client certificate (unsupported at this time)"))
+ (_other
+ (error "Gemini server response unknown: %s %s"
+ response-code response-meta))))))