Onde posso encontrar exemplos ou tutoriais sobre a ingestão de arquivos em um repositório do Fedora Commons usando PHP?

Estou tendo uma quantidade surpreendente de problemas para ingerir um arquivo de imagem em um repositório do Fedora Commons com PHP (e cURL). Além disso, não consigo encontrar nenhum exemplo prático disso sendo feito online. Existem exemplos completos ou tutoriais por aí?

Eu finalmente percebi isso. Acabei fazendo duas solicitações diferentes: uma para criar um novo objeto vazio no Fedora e outra para anexar um fluxo de dados a esse objeto. Aqui está o código (eu coloquei tudo isso em uma classe chamada Fedora, mas isso não é necessário e pode não se encaixar em suas necessidades):

<?php
    class Fedora {
        // Use cURL with the provided functions and return the result if the HTTP Code recieved matches the expected HTTP Code
        private function curlThis($curlOptions, $expectedHttpCode) {
            $returnValue = false;
            try {
                $curlHandle = curl_init();
                if ($curlHandle === false) {
                    throw new Exception(
                        "`curl_init()` returned `false`"
                    );
                }
                $settingOptionsSucceeded = curl_setopt_array($curlHandle, $curlOptions);
                if ($settingOptionsSucceeded === false) {
                    throw new Exception(
                        sprintf(
                            "`curl_setopt_array(...)` returned false. Error: %s. Info: %s",
                            curl_error($curlHandle),
                            print_r(curl_getinfo($curlHandle), true)
                        ),
                        curl_errno($curlHandle)
                    );
                }
                $curlReturn = curl_exec($curlHandle);
                if ($curlReturn === false) {
                    throw new Exception(
                        sprintf(
                            "`curl_exec(...)` returned false. Error: %s. Info: %s",
                            curl_error($curlHandle),
                            print_r(curl_getinfo($curlHandle), true)
                        ),
                        curl_errno($curlHandle)
                    );
                }
                $httpCode = curl_getinfo($curlHandle, CURLINFO_HTTP_CODE);
                if ($httpCode === false) {
                    throw new Exception(
                        sprintf(
                            "`curl_getinfo(...)` returned false. Error: %s.",
                            curl_error($curlHandle)
                        ),
                        curl_errno($curlHandle)
                    );
                }
                if ($httpCode !== $expectedHttpCode) {
                    throw new Exception(
                        sprintf(
                            "`curl_getinfo(...)` returned an unexpected http code (expected %s, but got %s). Error: %s. Complete info: %s",
                            $expectedHttpCode,
                            $httpCode,
                            curl_error($curlHandle),
                            print_r(curl_getinfo($curlHandle), true)
                        ),
                        curl_errno($curlHandle)
                    );
                }
                $returnValue = $curlReturn;
            } catch (Exception $e) {
                trigger_error(
                    sprintf(
                        "(%d) %s",
                        $e->getCode(),
                        $e->getMessage()
                    ),
                    E_USER_ERROR
                );
            }
            return $returnValue;
        }

        // Create a new empty object in Fedora Commons and return its pid
        private function createNewEmptyObject($prefix, $id) {
            $returnValue = false;

            // Build URL
            $protocol = variable_get("fedora_protocol");    // 'http'
            $host = variable_get("fedora_host");
            $port = variable_get("fedora_port");    // '8082'
            $context = variable_get("fedora_context");  // 'fedora'
            $pid = $prefix . ":" . $id;
            $url = sprintf(
                "%s://%s:%d/%s/objects/%s",
                $protocol,
                $host,
                $port,
                $context,
                $pid
            );

            // Build cURL options
            $userPassword = variable_get("fedora_username") . ":" . variable_get("fedora_password"); // username:password
            $verifyPeer = false; // false for ignoring self signed certificates
            $headers = array("Accept: text/xml", "Content-Type: text/xml");
            $curlOptions = array(
                CURLOPT_URL => $url,
                CURLOPT_HTTPHEADER => $headers,
                CURLOPT_USERPWD => $userPassword,
                CURLOPT_HTTPAUTH => CURLAUTH_BASIC,
                CURLOPT_SSL_VERIFYPEER => $verifyPeer,
                CURLOPT_FOLLOWLOCATION => true,
                CURLOPT_RETURNTRANSFER => true,
                CURLOPT_POST => true
            );

            // Try `cURL`ing
            $result = $this->curlThis($curlOptions, 201);
            if ($result === $pid) {
                $returnValue = $result;
            }
            return $returnValue;
        }

        private function attachDatastream ($pid, $file, $datastreamID) {

            $returnValue = false;

            // Build URL
            $protocol = variable_get("fedora_protocol");    // "http"
            $host = variable_get("fedora_host");
            $port = variable_get("fedora_port");    // 8082
            $context = variable_get("fedora_context");  // fedora
            $url = sprintf(
                "%s://%s:%d/%s/objects/%s/datastreams/%s?controlGroup=M",   // M stands for 'Managed Content'
                $protocol,
                $host,
                $port,
                $context,
                $pid,
                $datastreamID
            );

            // Build cURL options
            $userPassword = variable_get("fedora_username") . ":" . variable_get("fedora_password"); // username:password
            $verifyPeer = false; // false for ignoring self signed certificates
            $headers = array("Accept: text/xml", "Content-Type: " . $file->filemime);
            $fileContents = file_get_contents("sites/default/files/images/" . $file->filename);
            $curlOptions = array(
                CURLOPT_URL => $url,
                CURLOPT_HTTPHEADER => $headers,
                CURLOPT_USERPWD => $userPassword,
                CURLOPT_HTTPAUTH => CURLAUTH_BASIC,
                CURLOPT_SSL_VERIFYPEER => $verifyPeer,
                CURLOPT_FOLLOWLOCATION => true,
                CURLOPT_RETURNTRANSFER => true,
                CURLOPT_POST => true,
                CURLOPT_POSTFIELDS => $fileContents
            );

            // Try `cURL`ing
            $result = $this->curlThis($curlOptions, 201);
            if ($result === $pid) {
                $returnValue = $result;
            }
            return $returnValue;
        }

        public function ingest($namespace, $identifier, $file) {
            $pid = $this->createNewEmptyObject($namespace, $identifier);
            if ($pid) {
                $result = $this->attachDatastream($pid, $file, "IMAGE");
                if ($result) {
                    error_log("Successfully ingested a file!");
                } else {
                    error_log("FAILED ATTACHING DATASTREAM TO NEW OBJECT");
                }
            } else {
                error_log("FAILED CREATING NEW EMPTY OBJECT");
            }

        }
    }
    $fedora = new Fedora();
    /*
     * $file is an object obtained by uploading a file into a drupal file system (at /drupal/sites/default/files/images/singe.jpg). It has the following attributes:
     * $file->filemime === "image/jpeg"
     * $file->filename === "singe.jpg"
     */
    $fedora->ingest('namespace', 'identifier', $file);

?>