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<?php
/**
 * Created by PhpStorm.
 * User: crose
 * Date: 1/30/16
 * Time: 7:59 PM
 */

namespace qfq;

require_once(__DIR__ . '/../qfq/store/Store.php');
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require_once(__DIR__ . '/../qfq/store/Sip.php');
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require_once(__DIR__ . '/../qfq/Constants.php');
require_once(__DIR__ . '/../qfq/Evaluate.php');
//require_once(__DIR__ . '/../qfq/exceptions/UserException.php');
//require_once(__DIR__ . '/../qfq/exceptions/CodeException.php');
//require_once(__DIR__ . '/../qfq/exceptions/DbException.php');
//require_once(__DIR__ . '/../qfq/Evaluate.php');


class Save {

    private $formSpec = array();  // copy of the loaded form
    private $feSpecAction = array(); // copy of all formElement.class='action' of the loaded form
    private $feSpecNative = array(); // copy of all formElement.class='native' of the loaded form
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    private $feSpecNativeRaw = array(); // copy of all formElement.class='native' of the loaded form
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    /**
     * @var null|Store
     */
    private $store = null;
    private $db = null;

    private $evaluate = null;

    /**
     * @param array $formSpec
     * @param array $feSpecAction
     * @param array $feSpecNative
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     * @param array $feSpecNativeRaw
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     */
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    public function __construct(array $formSpec, array $feSpecAction, array $feSpecNative, array $feSpecNativeRaw) {
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        $this->formSpec = $formSpec;
        $this->feSpecAction = $feSpecAction;
        $this->feSpecNative = $feSpecNative;
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        $this->feSpecNativeRaw = $feSpecNativeRaw;
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        $this->store = Store::getInstance();
        $this->db = new Database();
        $this->evaluate = new Evaluate($this->store, $this->db);
    }

    /**
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     * Starts save process. On succcess, returns forwardmode/page.
     *
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     * @return int
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     * @throws CodeException
     * @throws DbException
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     * @throws UserFormException
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     */
    public function process() {
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        $rc = 0;
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        if ($this->formSpec['multiMode'] !== 'none') {

            $parentRecords = $this->db->sql($this->formSpec['multiSql']);
            foreach ($parentRecords as $row) {
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                $this->store->setStore($row, STORE_PARENT_RECORD, true);
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                $rc = $this->elements($row['_id']);
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            }
        } else {
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            $recordId = $this->store->getVar(SIP_RECORD_ID, STORE_SIP . STORE_ZERO);
            $rc = $this->elements($recordId);
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        }
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        return $rc;
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    }

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    /**
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     * Create empty FormElements based on templateGroups, for those who not already exist.
     *
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     * @param array $formValues
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     *
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     * @return array
     */
    private function createEmptyTemplateGroupElements(array $formValues) {

        foreach ($this->feSpecNative as $formElement) {

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            switch ($formElement[FE_TYPE]) {
//                case FE_TYPE_EXTRA:
                case FE_TYPE_NOTE:
                case FE_TYPE_SUBRECORD:
                    continue 2;
                default:
                    break;
            }
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            $feName = $formElement[FE_NAME];
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            if (!isset($formValues[$feName]) && $this->isMemberOfTemplateGroup($formElement)) {
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                $formValues[$feName] = $formElement[FE_VALUE];
            }
        }
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        return $formValues;
    }

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    /**
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     * Check if the current $formElement is member of a templateGroup.
     *
     * @param array $formElement
     * @param int $depth
     * @return bool
     * @throws UserFormException
     */
    private function isMemberOfTemplateGroup(array $formElement, $depth = 0) {
        $depth++;

        if ($depth > 15) {
            throw new UserFormException('FormElement nested too much (in each other - endless?): stop recursion', ERROR_FE_NESTED_TOO_MUCH);
        }

        if ($formElement[FE_TYPE] == FE_TYPE_TEMPLATE_GROUP) {
            return true;
        }

        if ($formElement[FE_ID_CONTAINER] == 0) {
            return false;
        }

        // Get the parent element
        $formElementArr = OnArray::filter($this->feSpecNativeRaw, FE_ID, $formElement[FE_ID_CONTAINER]);
        if (isset($formElementArr[0])) {
            return $this->isMemberOfTemplateGroup($formElementArr[0], $depth);
        }

        return false; // This should not be reached,
    }

    /**
     *
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     * @param $feName
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     *
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     * @return bool
     */
    private function isSetEmptyMeansNull($feName) {

        $fe = OnArray::filter($this->feSpecNative, FE_NAME, $feName);

        $flag = isset($fe[0][FE_EMPTY_MEANS_NULL]) && $fe[0][FE_EMPTY_MEANS_NULL] != '0';

        return $flag;
    }

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    /**
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     * Build an array of all values which should be saved. Values must exist as a 'form value' as well as a regular
     * 'table column'.
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     *
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     * @param $recordId
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     *
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     * @return int   record id (in case of insert, it's different from $recordId)
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     * @throws CodeException
     * @throws DbException
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     * @throws UserFormException
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     */
    public function elements($recordId) {
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        $columnCreated = false;
        $columnModified = false;
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        $newValues = array();

        $tableColumns = array_keys($this->store->getStore(STORE_TABLE_COLUMN_TYPES));
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        $formValues = $this->store->getStore(STORE_FORM);
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        $formValues = $this->createEmptyTemplateGroupElements($formValues);
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        // Iterate over all table.columns. Built an assoc array $newValues.
        foreach ($tableColumns AS $column) {
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            // Never save a predefined 'id': autoincrement values will be given by database..
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            if ($column === COLUMN_ID) {
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                continue;
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            }
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            // Skip Upload Elements: those will be processed later.
            if ($this->isColumnUploadField($column)) {
                continue;
            }

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            if ($column === COLUMN_CREATED) {
                $columnCreated = true;
            }

            if ($column === COLUMN_MODIFIED) {
                $columnModified = true;
            }

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            // Is there a value? Do not forget SIP values. Those do not have necessarily a FormElement.
            if (!isset($formValues[$column])) {
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                continue;
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            }

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            $this->store->setVar(SYSTEM_FORM_ELEMENT, "Column: $column", STORE_SYSTEM);
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            // Check if an empty string has to be converted to null.
            if (isset($formValues[$column]) && $formValues[$column] == '' && $this->isSetEmptyMeansNull($column)) {
                $formValues[$column] = null;
            } else {
                Support::setIfNotSet($formValues, $column);
            }
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            $newValues[$column] = $formValues[$column];
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        }

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        if ($columnModified && !isset($newValues[COLUMN_MODIFIED])) {
            $newValues[COLUMN_MODIFIED] = date('YmdHis');
        }

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        if ($recordId == 0) {
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            if ($columnCreated && !isset($newValues[COLUMN_CREATED])) {
                $newValues[COLUMN_CREATED] = date('YmdHis');
            }
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            $rc = $this->insertRecord($this->formSpec[F_TABLE_NAME], $newValues);
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        } else {
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            $this->updateRecord($this->formSpec[F_TABLE_NAME], $newValues, $recordId);
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            $rc = $recordId;
        }

        return $rc;
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    }

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    /*
     * Checks if there is a formElement with name '$feName' of type 'upload'
     *
     * @param $feName
     * @return bool
     */
    private function isColumnUploadField($feName) {

        foreach ($this->feSpecNative AS $formElement) {
            if ($formElement[FE_NAME] === $feName && $formElement[FE_TYPE] == 'upload')
                return true;
        }
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        return false;
    }

    /**
     * Insert new record in table $this->formSpec['tableName'].
     *
     * @param array $values
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     *
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     * @return int  last insert id
     * @throws DbException
     */
    public function insertRecord($tableName, array $values) {

        if (count($values) === 0)
            return 0; // nothing to write, last insert id=0

        $paramList = str_repeat('?, ', count($values));
        $paramList = substr($paramList, 0, strlen($paramList) - 2);
        $columnList = '`' . implode('`, `', array_keys($values)) . '`';

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        $sql = "INSERT INTO $tableName ( " . $columnList . " ) VALUES ( " . $paramList . ' )';
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        $rc = $this->db->sql($sql, ROW_REGULAR, array_values($values));

        return $rc;
    }

    /**
     * @param string $tableName
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     * @param array $values
     * @param int $recordId
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     *
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     * @return bool|int     false if $values is empty, else affectedrows
     * @throws CodeException
     * @throws DbException
     */
    public function updateRecord($tableName, array $values, $recordId) {

        if (count($values) === 0)
            return 0; // nothing to write, 0 rows affected

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        if ($recordId === 0) {
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            throw new CodeException('RecordId=0 - this is not possible for update.', ERROR_RECORDID_0_FORBIDDEN);
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        }
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//        $paramList = str_repeat('?, ', count($values));
//        $paramList = substr($paramList, 0, strlen($paramList) - 2);

        $sql = 'UPDATE `' . $tableName . '` SET ';

        foreach ($values as $column => $value) {

            $sql .= '`' . $column . '` = ?, ';
        }

        $sql = substr($sql, 0, strlen($sql) - 2) . ' WHERE id = ?';
        $values[] = $recordId;

        $rc = $this->db->sql($sql, ROW_REGULAR, array_values($values));

        return $rc;
    }

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    /**
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     * Process all Upload Formelements for the given $recordId. After processing &$formValues will be updated with the
     * final filenames.
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     *
     */
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    public function processAllUploads($recordId) {

        $sip = new Sip(false);
        $newValues = array();

        $formValues = $this->store->getStore(STORE_FORM);
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        $primaryRecord = $this->store->getStore(STORE_RECORD); // necessary to check if the current formElement exist as a column of the primary table.
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        foreach ($this->feSpecNative AS $formElement) {
            // skip non upload formElements
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            if ($formElement[FE_TYPE] != FE_TYPE_UPLOAD) {
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                continue;
            }

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            $formElement = HelperFormElement::initUploadFormElement($formElement);
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            if (isset($formElement[FE_FILL_STORE_VAR])) {
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                $this->store->appendToStore($formElement[FE_FILL_STORE_VAR], STORE_VAR);
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            }
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            // Preparation for Log, Debug
            $this->store->setVar(SYSTEM_FORM_ELEMENT, Logger::formatFormElementName($formElement), STORE_SYSTEM);

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            $column = $formElement[FE_NAME];
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            $pathFileName = $this->doUpload($formElement, $formValues[$column], $sip, $modeUpload);
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            // Upload Type: Simple or Advanced
            if (isset($primaryRecord[$column])) {
                // 'Simple Upload': no special action needed, just process the current (maybe modifired) value.
                if ($pathFileName !== false) {
                    $newValues[$column] = $pathFileName;
                }
            } else {
                // 'Advanced Upload'
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                $this->doUploadSlave($formElement, $modeUpload);
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            }
        }
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        // Only used in 'Simple Upload'
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        if (count($newValues) > 0) {
            $this->updateRecord($this->formSpec[F_TABLE_NAME], $newValues, $recordId);
        }
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    }

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    /**
     * Process all Upload Formelements for the given $recordId. After processing &$formValues will be updated with the
     * final filenames.
     *
     */
    public function processAllImageCutFE() {

        foreach ($this->feSpecNative AS $formElement) {
            // skip non upload formElements
            if ($formElement[FE_TYPE] != FE_TYPE_IMAGE_CUT) {
                continue;
            }

            $this->extractImageDataReplaceFile($formElement);
        }
    }

    /**
     *
     * @param array $formElement
     * @throws CodeException
     * @throws UserFormException
     */
    private function extractImageDataReplaceFile(array $formElement) {

        // Take care the necessary target directories exist.
        $cwd = getcwd();
        $sitePath = $this->store->getVar(SYSTEM_SITE_PATH, STORE_SYSTEM);
        if ($cwd === false || $sitePath === false || !chdir($sitePath)) {
            throw new UserFormException("getcwd() failed or SITE_PATH undefined or chdir('$sitePath') failed.", ERROR_IO_CHDIR);
        }

        // Get original pathfilename
        $field = HelperFormElement::AppendFormElementNameImageCut($formElement);
        $pathFileName = $this->store->getVar($field, STORE_SIP);
        if ($pathFileName == '' || !file_exists($pathFileName)) {
            throw new UserFormException('Empty file or file not found: ' . $pathFileName, ERROR_IO_FILE_NOT_FOUND);
        }

        // 'data:image/png;base64,AAAFBfj42Pj4...';
        $data = $this->store->getVar($formElement[FE_NAME], STORE_FORM, SANITIZE_ALLOW_ALLBUT);
        // Replace data by pathFileName (that is stored in DB).
        $this->store->setVar($formElement[FE_NAME], $pathFileName, STORE_FORM, true);

        if ($data == '') {
            return; // Nothing to do
        }

        // Split base64 encoded image: 'data:image/png;base64,AAAFBfj42Pj4...'
        list($type, $imageData) = explode(';', $data, 2); // $type= 'data:image/png;', $imageData='base64,AAAFBfj42Pj4...'
        list(, $extension) = explode('/', $type); // $type='png'
        list(, $imageData) = explode(',', $imageData); // $imageData='AAAFBfj42Pj4...'

        // If undefined: set default. BTW: Defined and empty means "no original".
        if (!isset($formElement[FE_IMAGE_CUT_KEEP_ORIGINAL])) {
            $formElement[FE_IMAGE_CUT_KEEP_ORIGINAL] = FE_IMAGE_CUT_ORIGINAL_EXTENSION;
        }
        $extSave = $formElement[FE_IMAGE_CUT_KEEP_ORIGINAL];

        $pathParts = pathinfo($pathFileName);
        // Keep the original file?
        if ($extSave != '') {

            // In case the leading '.' is missing.
            if ($extSave[0] != ".") {
                $extSave = '.' . $extSave;
            }

            // Check if there is already an original - don't create an additional one.
            if (!file_exists($pathFileName . $extSave) &&
                !file_exists($pathParts['dirname'] . $pathParts['filename'] . $extSave)
            ) {
                if (!rename($pathFileName, $pathFileName . $extSave)) {
                    throw new UserFormException("Rename file: '$pathFileName' > '$pathFileName$extSave'", ERROR_IO_RENAME);
                }
            }
        }

        if ($extension != $pathParts['extension']) {
            $pathFileName .= "." . $extension;
        }

        if (false === file_put_contents($pathFileName, base64_decode($imageData))) {
            throw new UserFormException("Write new image failed: $pathFileName", ERROR_IO_WRITE);
        }

        $this->store->setVar($formElement[FE_NAME], $pathFileName, STORE_FORM, true);
    }

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    /**
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     * Process upload for the given Formelement. If necessary, delete a previous uploaded file.
     * Calculate the final path/filename and move the file to the new location.
     *
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     * Check also: doc/CODING.md
     *
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     * @param array $formElement FormElement 'upload'
     * @param string $sipUpload SIP
     * @param Sip $sip
     * @param string $modeUpload UPLOAD_MODE_UNCHANGED | UPLOAD_MODE_NEW | UPLOAD_MODE_DELETEOLD |
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     *                            UPLOAD_MODE_DELETEOLD_NEW
     *
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     * @return false|string New pathFilename or false on error
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     * @throws CodeException
     * @throws UserFormException
     * @internal param $recordId
     */
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    private function doUpload($formElement, $sipUpload, Sip $sip, &$modeUpload) {
        $flagDelete = false;
        $modeUpload = UPLOAD_MODE_UNCHANGED;
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        // Status information about upload file
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        $statusUpload = $this->store->getVar($sipUpload, STORE_EXTRA);
        if ($statusUpload === false) {
            return false;
        }

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        // Take care the necessary target directories exist.
        $cwd = getcwd();
        $sitePath = $this->store->getVar(SYSTEM_SITE_PATH, STORE_SYSTEM);
        if ($cwd === false || $sitePath === false || !chdir($sitePath)) {
            throw new UserFormException("getcwd() failed or SITE_PATH undefined or chdir('$sitePath') failed.", ERROR_IO_CHDIR);
        }

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        // Delete existing old file.
        if (isset($statusUpload[FILES_FLAG_DELETE]) && $statusUpload[FILES_FLAG_DELETE] == '1') {
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            $arr = $sip->getVarsFromSip($sipUpload);
            $oldFile = $arr[EXISTING_PATH_FILE_NAME];
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            if (file_exists($oldFile)) {
                if (!unlink($oldFile)) {
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                    throw new UserFormException('Unlink file failed: ' . $oldFile, ERROR_IO_UNLINK);
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                }
            }
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            $flagDelete = ($oldFile != '');
        }

        // Set $modeUpload
        if (isset($statusUpload[FILES_TMP_NAME]) && $statusUpload[FILES_TMP_NAME] != '') {
            $modeUpload = $flagDelete ? UPLOAD_MODE_DELETEOLD_NEW : UPLOAD_MODE_NEW;
        } else {
            $modeUpload = $flagDelete ? UPLOAD_MODE_DELETEOLD : UPLOAD_MODE_UNCHANGED;
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        }

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        $pathFileName = $this->copyUploadFile($formElement, $statusUpload);

        chdir($cwd);

        // Delete current used uniq SIP
        $this->store->setVar($sipUpload, array(), STORE_EXTRA);

        return $pathFileName;
    }

    /**
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     * Copy uploaded file from temporary location to final location.
     *
     * Check also: doc/CODING.md
     *
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     * @param array $formElement
     * @param array $statusUpload
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     *
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     * @return array|mixed|null|string
     * @throws CodeException
     * @throws UserFormException
     */
    private function copyUploadFile(array $formElement, array $statusUpload) {
        $pathFileName = '';

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        if (!isset($statusUpload[FILES_TMP_NAME]) || $statusUpload[FILES_TMP_NAME] === '') {
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            // nothing to upload: e.g. user has deleted a previous uploaded file.
            return '';
        }

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        if (isset($formElement[FE_FILE_DESTINATION])) {
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            // Provide variable 'filename'. Might be substituted in $formElement[FE_PATH_FILE_NAME].
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            $origFilename = Sanitize::safeFilename($statusUpload[FILES_NAME]);
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            $pathParts = pathinfo($origFilename);
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            $this->store->setVar(VAR_FILENAME, $origFilename, STORE_VAR);
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            if (isset($pathParts['filename'])) {
                $this->store->setVar(VAR_FILENAME_BASE, $pathParts['filename'], STORE_VAR);
            }
            if (isset($pathParts['extension'])) {
                $this->store->setVar(VAR_FILENAME_EXT, $pathParts['extension'], STORE_VAR);
            }
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            $pathFileName = $this->evaluate->parse($formElement[FE_FILE_DESTINATION]);
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            // Saved in store for later use during 'Advanced Upload'-post processing
            $this->store->setVar(VAR_FILE_DESTINATION, $pathFileName, STORE_VAR);
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        }

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        if ($pathFileName === '') {
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            throw new UserFormException("Upload failed, no target '" . FE_FILE_DESTINATION . "' specified.", ERROR_NO_TARGET_PATH_FILE_NAME);
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        }

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        if (file_exists($pathFileName)) {
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            if (isset($formElement[FE_FILE_REPLACE_MODE]) && $formElement[FE_FILE_REPLACE_MODE] == FE_FILE_REPLACE_MODE_ALWAYS) {
                if (!unlink($pathFileName)) {
                    throw new UserFormException('Copy upload failed - file exist and unlink() failed: ' . $pathFileName, ERROR_IO_UNLINK);
                }
            } else {
                throw new UserFormException('Copy upload failed - file already exist: ' . $pathFileName, ERROR_IO_FILE_EXIST);
            }
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        }
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        Support::mkDirParent($pathFileName);
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        $srcFile = Support::extendFilename($statusUpload[FILES_TMP_NAME], UPLOAD_CACHED);
        if (!rename($srcFile, $pathFileName)) {
            throw new UserFormException("Rename file: '$srcFile' > '$pathFileName'", ERROR_IO_RENAME);
        }
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        $this->splitUpload($formElement, $pathFileName);

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        return $pathFileName;
    }
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    /**
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     * Check's if the file $pathFileName should be splitted in one file per page. If no: do nothing and return.
     * The only possible split target file format is 'svg': fileSplit=svg.
     * The splitted files will be saved under fileDestinationSplit=some/path/to/file.%02d.svg. A printf style token,
     * like '%02d', is needed to create distinguished filename's. See 'man pdf2svg' for further details.
     * For every created file, a record in table 'Split' is created (see splitSvg() ), storing the pathFileName of the
     * current page/file.
     *
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     * @param array $formElement
     * @param $pathFileName
     * @throws UserFormException
     */
    private function splitUpload(array $formElement, $pathFileName) {

        if (empty($formElement[FE_FILE_SPLIT]) || empty($formElement[FE_FILE_DESTINATION_SPLIT])) {
            return;
        }

        $fileDestinationSplit = $this->evaluate->parse($formElement[FE_FILE_DESTINATION_SPLIT]);
        $fileSplit = $this->evaluate->parse($formElement[FE_FILE_SPLIT]);
        $fileSplitTableName = $this->evaluate->parse($formElement[FE_FILE_SPLIT_TABLE_NAME]);

        if (empty($fileSplitTableName)) {
            $fileSplitTableName = $this->formSpec[F_TABLE_NAME];
        }

        // Filetype testen: nur Dateien splitten die man auch wirklich entpacken kann
        switch ($fileSplit) {
            case FE_FILE_SPLIT_SVG:
                $this->splitSvg($pathFileName, $fileDestinationSplit, $fileSplitTableName);
                break;
            default:
                throw new UserFormException("Unknown 'fileSplit' type: " . $formElement[FE_FILE_SPLIT], ERROR_UNKNOWN_TOKEN);
        }
    }

    /**
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     * Split's the PDF file $pathFileNameSrc in several SVG-file, one per page.
     * For every created file, a record in table 'Split' is created, storing the pathFileName to the individual file.
     *
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     * @param $pathFileNameSrc
     * @param $fileDestinationSplit
     * @throws CodeException
     * @throws DbException
     * @throws UserFormException
     */
    private function splitSvg($pathFileNameSrc, $fileDestinationSplit, $fileSplitTableName) {

        Support::mkDirParent($fileDestinationSplit);

        // Save CWD
        $cwd = getcwd();

        // Create temporary directory
        $tempDir = Support::createTempDir();
        $newSrc = $tempDir . DIRECTORY_SEPARATOR . QFQ_TEMP_SOURCE;
        $rc = copy($pathFileNameSrc, $newSrc);

        $rc = chdir($tempDir);

        // Split destination.
        $pathParts = pathinfo($fileDestinationSplit);
        if (empty($pathParts['filename']) || empty($pathParts['basename'])) {
            throw new UserFormException('Missing filename in ' . FE_FILE_DESTINATION_SPLIT, ERROR_MISSING_FILE_NAME);
        }

        // Extract filename from destination directory.
        $fileNameDest = $pathParts['basename'];

        // Split PDF
        $rc = exec('pdf2svg "' . $newSrc . '" "' . $fileNameDest . '" all');

        // Array of created filenames.
        $files = scandir('.');

        // Create DB records according to the extracted filenames.
        $tableName = TABLE_NAME_SPLIT;
        $sql = "INSERT INTO $tableName (`tableName`, `xId`, `pathFilename`, `created`) VALUES (?,?,?, NOW())";

        foreach ($files as $file) {

            if ($file == '.' || $file == '..' || $file == QFQ_TEMP_SOURCE) {
                continue;
            }

            if (!empty($pathParts['dirname'])) {
                $fileDestination = $pathParts['dirname'] . '/' . $file;
            } else {
                $fileDestination = $file;
            }

            $rc = rename($file, Support::joinPath($cwd, $fileDestination));

            // Insert records.
            $this->db->sql($sql, ROW_REGULAR, [$fileSplitTableName, $this->store->getVar(COLUMN_ID, STORE_RECORD), $fileDestination]);
        }

        // Pop directory
        $rc = chdir($cwd);

        // Remove duplicated source
        $rc = unlink($newSrc);
        // Remove empty directory
        $rc = rmdir($tempDir);
    }

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    /**
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     * Create/update or delete the slave record.
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     *
     * @param array $fe
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     * @param $modeUpload
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     * @return int
     * @throws CodeException
     * @throws UserFormException
     */
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    private function doUploadSlave(array $fe, $modeUpload) {
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        $sql = '';
        $flagUpdateSlaveId = false;
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        $flagSlaveDeleted = false;
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        if (!isset($fe[FE_SLAVE_ID])) {
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            throw new UserFormException("Missing 'slaveId'-definition", ERROR_MISSING_SLAVE_ID_DEFINITION);
        }

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        // Get the slaveId
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        $slaveId = Support::falseEmptyToZero($this->evaluate->parse($fe[FE_SLAVE_ID]));
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        // Store the slaveId: it's used and replaced in the update statement.
        $this->store->setVar(VAR_SLAVE_ID, $slaveId, STORE_VAR, true);

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        $mode = ($slaveId == '0') ? 'I' : 'U'; // I=Insert, U=Update
        $mode .= ($modeUpload == UPLOAD_MODE_NEW || $modeUpload == UPLOAD_MODE_DELETEOLD_NEW) ? 'N' : ''; // N=New File, '' if no new file.
        $mode .= ($modeUpload == UPLOAD_MODE_DELETEOLD) ? 'D' : ''; // Delete slave record only if there is no new and not 'unchanged'.
        switch ($mode) {
            case 'IN':
                $sql = $fe[FE_SQL_INSERT];
                $flagUpdateSlaveId = true;
                break;
            case 'UN':
                $sql = $fe[FE_SQL_UPDATE];
                break;
            case 'I':
            case 'U':
                $sql = ''; // no old file and no new file.
                break;
            case 'UD':
                $sql = $fe[FE_SQL_DELETE];
                $flagSlaveDeleted = true;
                break;
            default:
                throw new CodeException('Unknown mode: ' . $mode, ERROR_UNKNOWN_MODE);
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        }

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        // If given: fire a sqlBefore query
        $this->evaluate->parse($fe[FE_SQL_BEFORE]);
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        $rc = $this->evaluate->parse($sql);
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        // Check if the slave record has been deleted: if yes, set slaveId=0
        if ($flagSlaveDeleted && $rc > 0) {
            $rc = 0;
            $flagUpdateSlaveId = true;
        }
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        if ($flagUpdateSlaveId) {
            // Store the slaveId: it's used and replaced in the update statement.
            $this->store->setVar(VAR_SLAVE_ID, $rc, STORE_VAR, true);
            $slaveId = $rc;
        }

        // If given: fire a sqlAfter query
        $this->evaluate->parse($fe[FE_SQL_AFTER]);

        return $slaveId;
    }
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}