[asterisk-commits] mjordan: branch 12 r400771 - /branches/12/res/res_pjsip_header_funcs.c
SVN commits to the Asterisk project
asterisk-commits at lists.digium.com
Tue Oct 8 17:58:05 CDT 2013
Author: mjordan
Date: Tue Oct 8 17:58:04 2013
New Revision: 400771
URL: http://svnview.digium.com/svn/asterisk?view=rev&rev=400771
Log:
Add PJSIP_HEADER function for manipulation of SIP headers in the PJSIP stack
This patch adds support to the PJSIP stack in Asterisk for SIP header
manipulation. Note that this is analagous to SIPAddHeader/SIPRemoveHeader.
For PJSIP_HEADER, an incoming supplemental session callback is registered that
takes the pjsip_hdrs from the incoming session and stores them in a linked
list in the session datastore. Calls to PJSIP_HEADER traverse over the list
and return the nth matching header where 'n' is the 'number' argument to the
function.
When adding a header, the first call creates a datastore and linked list and
adds the datastore to the session. The header is then created as a pjsip_hdr
and added to the list. An outgoing supplemental session callback then
traverses the list and adds the headers to the outgoing pjsip_msg.
When removing a header, the list created with PJSIP_HEADER(add,...) is
traversed and all matching entries are removed.
(closes issue ASTERISK-22498)
Reported by: George Joseph
patch:
res_pjsip_header_funcs_v1.patch uploaded by george.joseph (License 6322)
Added:
branches/12/res/res_pjsip_header_funcs.c (with props)
Added: branches/12/res/res_pjsip_header_funcs.c
URL: http://svnview.digium.com/svn/asterisk/branches/12/res/res_pjsip_header_funcs.c?view=auto&rev=400771
==============================================================================
--- branches/12/res/res_pjsip_header_funcs.c (added)
+++ branches/12/res/res_pjsip_header_funcs.c Tue Oct 8 17:58:04 2013
@@ -1,0 +1,609 @@
+/*
+ * Asterisk -- An open source telephony toolkit.
+ *
+ * Copyright (C) 2013, Fairview 5 Engineering, LLC
+ *
+ * George Joseph <george.joseph at fairview5.com>
+ *
+ * See http://www.asterisk.org for more information about
+ * the Asterisk project. Please do not directly contact
+ * any of the maintainers of this project for assistance;
+ * the project provides a web site, mailing lists and IRC
+ * channels for your use.
+ *
+ * This program is free software, distributed under the terms of
+ * the GNU General Public License Version 2. See the LICENSE file
+ * at the top of the source tree.
+ */
+
+/*** MODULEINFO
+ <depend>pjproject</depend>
+ <depend>res_pjsip</depend>
+ <depend>res_pjsip_session</depend>
+ <support_level>core</support_level>
+ ***/
+
+#include "asterisk.h"
+
+#include <pjsip.h>
+#include <pjsip_ua.h>
+
+#include "asterisk/res_pjsip.h"
+#include "asterisk/res_pjsip_session.h"
+#include "asterisk/channel.h"
+#include "asterisk/pbx.h"
+#include "asterisk/app.h"
+#include "asterisk/module.h"
+#include "asterisk/utils.h"
+
+/*** DOCUMENTATION
+ <function name="PJSIP_HEADER" language="en_US">
+ <synopsis>
+ Gets, adds, updates or removes the specified SIP header from a PJSIP session.
+ </synopsis>
+ <syntax>
+ <parameter name="action" required="true">
+ <enumlist>
+ <enum name="read"><para>Returns instance <replaceable>number</replaceable>
+ of header <replaceable>name</replaceable>.</para></enum>
+
+ <enum name="add"><para>Adds a new header <replaceable>name</replaceable>
+ to this session.</para></enum>
+
+ <enum name="update"><para>Updates instance <replaceable>number</replaceable>
+ of header <replaceable>name</replaceable> to a new value.
+ The header must already exist.</para></enum>
+
+ <enum name="remove"><para>Removes all instances of previously added headers
+ whose names match <replaceable>name</replaceable>. A <literal>*</literal>
+ may be appended to <replaceable>name</replaceable> to remove all headers
+ <emphasis>beginning with</emphasis> <replaceable>name</replaceable>.
+ <replaceable>name</replaceable> may be set to a single <literal>*</literal>
+ to clear <emphasis>all</emphasis> previously added headers. In all cases,
+ the number of headers actually removed is returned.</para></enum>
+ </enumlist>
+ </parameter>
+
+ <parameter name="name" required="true"><para>The name of the header.</para></parameter>
+
+ <parameter name="number" required="false">
+ <para>If there's more than 1 header with the same name, this specifies which header
+ to read or update. If not specified, defaults to <literal>1</literal> meaning
+ the first matching header. Not valid for <literal>add</literal> or
+ <literal>remove</literal>.</para>
+ </parameter>
+
+ </syntax>
+ <description>
+ <para>Examples:</para>
+ <para>;</para>
+ <para>; Set 'somevar' to the value of the 'From' header.</para>
+ <para>exten => 1,1,Set(somevar=${PJSIP_HEADER(read,From)})</para>
+ <para>;</para>
+ <para>; Set 'via2' to the value of the 2nd 'Via' header.</para>
+ <para>exten => 1,1,Set(via2=${PJSIP_HEADER(read,Via,2)})</para>
+ <para>;</para>
+ <para>; Add an 'X-Myheader' header with the value of 'myvalue'.</para>
+ <para>exten => 1,1,Set(PJSIP_HEADER(add,X-MyHeader)=myvalue)</para>
+ <para>;</para>
+ <para>; Add an 'X-Myheader' header with an empty value.</para>
+ <para>exten => 1,1,Set(PJSIP_HEADER(add,X-MyHeader)=)</para>
+ <para>;</para>
+ <para>; Update the value of the header named 'X-Myheader' to 'newvalue'.</para>
+ <para>; 'X-Myheader' must already exist or the call will fail.</para>
+ <para>exten => 1,1,Set(PJSIP_HEADER(update,X-MyHeader)=newvalue)</para>
+ <para>;</para>
+ <para>; Remove all headers whose names exactly match 'X-MyHeader'.</para>
+ <para>exten => 1,1,Set(PJSIP_HEADER(remove,X-MyHeader)=)</para>
+ <para>;</para>
+ <para>; Remove all headers that begin with 'X-My'.</para>
+ <para>exten => 1,1,Set(PJSIP_HEADER(remove,X-My*)=)</para>
+ <para>;</para>
+ <para>; Remove all previously added headers.</para>
+ <para>exten => 1,1,Set(PJSIP_HEADER(remove,*)=)</para>
+ <para>;</para>
+
+ <note><para>The <literal>remove</literal> action can be called by reading
+ <emphasis>or</emphasis> writing PJSIP_HEADER.</para>
+ <para>;</para>
+ <para>; Display the number of headers removed</para>
+ <para>exten => 1,1,Verbose( Removed ${PJSIP_HEADER(remove,X-MyHeader)} headers)</para>
+ <para>;</para>
+ <para>; Set a variable to the number of headers removed</para>
+ <para>exten => 1,1,Set(count=${PJSIP_HEADER(remove,X-MyHeader)})</para>
+ <para>;</para>
+ <para>; Just remove them ignoring any count</para>
+ <para>exten => 1,1,Set(=${PJSIP_HEADER(remove,X-MyHeader)})</para>
+ <para>exten => 1,1,Set(PJSIP_HEADER(remove,X-MyHeader)=)</para>
+ <para>;</para>
+ </note>
+
+ <note><para>If you call PJSIP_HEADER in a normal dialplan context you'll be
+ operating on the <emphasis>caller's (incoming)</emphasis> channel which
+ may not be what you want. To operate on the <emphasis>callee's (outgoing)</emphasis>
+ channel call PJSIP_HEADER in a pre-dial handler. </para>
+ <para>Example:</para>
+ <para>;</para>
+ <para>[handler]</para>
+ <para>exten => addheader,1,Set(PJSIP_HEADER(add,X-MyHeader)=myvalue)</para>
+ <para>exten => addheader,2,Set(PJSIP_HEADER(add,X-MyHeader2)=myvalue2)</para>
+ <para>;</para>
+ <para>[somecontext]</para>
+ <para>exten => 1,1,Dial(PJSIP/${EXTEN},,b(handler^addheader^1))</para>
+ <para>;</para>
+ </note>
+ </description>
+ </function>
+ ***/
+
+/*! \brief Linked list for accumulating headers */
+struct hdr_list_entry {
+ pjsip_hdr *hdr;
+ AST_LIST_ENTRY(hdr_list_entry) nextptr;
+};
+AST_LIST_HEAD(hdr_list, hdr_list_entry);
+
+/*! \brief Destructor for hdr_list */
+static void hdr_list_destroy(void *obj)
+{
+ AST_LIST_HEAD_DESTROY((struct hdr_list *) obj);
+}
+
+/*! \brief Datastore for saving headers */
+static const struct ast_datastore_info header_datastore = {
+ .type = "header_datastore",
+ .destroy = hdr_list_destroy,
+};
+
+/*! \brief Data structure used for ast_sip_push_task_synchronous */
+struct header_data {
+ struct ast_sip_channel_pvt *channel;
+ char *header_name;
+ const char *header_value;
+ char *buf;
+ int header_number;
+ size_t len;
+};
+
+/*!
+ * \internal
+ * \brief Insert the header pointers into the linked list.
+ *
+ * For each header in the message, allocate a list entry,
+ * clone the header, then insert the entry.
+ */
+static int insert_headers(pj_pool_t * pool, struct hdr_list *list, pjsip_msg * msg)
+{
+ pjsip_hdr *hdr = msg->hdr.next;
+ struct hdr_list_entry *le;
+
+ while (hdr && hdr != &msg->hdr) {
+ le = pj_pool_zalloc(pool, sizeof(struct hdr_list_entry));
+ le->hdr = pjsip_hdr_clone(pool, hdr);
+ AST_LIST_INSERT_TAIL(list, le, nextptr);
+ hdr = hdr->next;
+ }
+
+ return 0;
+}
+
+/*!
+ * \internal
+ * \brief Session supplement callback on an incoming INVITE request
+ *
+ * Retrieve the header_datastore from the session or create one if it doesn't exist.
+ * Create and initialize the list if needed.
+ * Insert the headers.
+ */
+static int incoming_request(struct ast_sip_session *session, pjsip_rx_data * rdata)
+{
+ pj_pool_t *pool = session->inv_session->dlg->pool;
+ RAII_VAR(struct ast_datastore *, datastore,
+ ast_sip_session_get_datastore(session, header_datastore.type), ao2_cleanup);
+
+ if (!datastore) {
+ if (!(datastore =
+ ast_sip_session_alloc_datastore(&header_datastore, header_datastore.type))
+ ||
+ !(datastore->data = pj_pool_alloc(pool, sizeof(struct hdr_list))) ||
+ ast_sip_session_add_datastore(session, datastore)) {
+ ast_log(AST_LOG_ERROR, "Unable to create datastore for header functions.\n");
+ return 0;
+ }
+ AST_LIST_HEAD_INIT((struct hdr_list *) datastore->data);
+ }
+ insert_headers(pool, (struct hdr_list *) datastore->data, rdata->msg_info.msg);
+
+ return 0;
+}
+
+/*!
+ * \internal
+ * \brief Search list for nth occurrence of specific header.
+ */
+static pjsip_hdr *find_header(struct hdr_list *list, const char *header_name,
+ int header_number)
+{
+ struct hdr_list_entry *le;
+ pjsip_hdr *hdr = NULL;
+ int i = 1;
+
+ if (!list || ast_strlen_zero(header_name) || header_number < 1) {
+ return NULL;
+ }
+
+ AST_LIST_TRAVERSE(list, le, nextptr) {
+ if (pj_stricmp2(&le->hdr->name, header_name) == 0 && i++ == header_number) {
+ hdr = le->hdr;
+ break;
+ }
+ }
+
+ return hdr;
+}
+
+
+/*!
+ * \internal
+ * \brief Implements PJSIP_HEADER 'read' by searching the for the requested header.
+ *
+ * Retrieve the header_datastore.
+ * Search for the nth matching header.
+ * Validate the pjsip_hdr found.
+ * Parse pjsip_hdr into a name and value.
+ * Return the value.
+ */
+static int read_header(void *obj)
+{
+ struct header_data *data = obj;
+ pjsip_hdr *hdr = NULL;
+ char *pj_hdr_string;
+ size_t pj_hdr_string_len;
+ char *p;
+ size_t plen;
+ RAII_VAR(struct ast_datastore *, datastore,
+ ast_sip_session_get_datastore(data->channel->session, header_datastore.type),
+ ao2_cleanup);
+
+ if (!datastore || !datastore->data) {
+ ast_debug(1, "There was no datastore from which to read headers.\n");
+ return -1;
+ }
+
+ hdr = find_header((struct hdr_list *) datastore->data, data->header_name,
+ data->header_number);
+
+ if (!hdr) {
+ ast_debug(1, "There was no header named %s.\n", data->header_name);
+ return -1;
+ }
+
+ pj_hdr_string = ast_alloca(data->len);
+ pj_hdr_string_len = pjsip_hdr_print_on(hdr, pj_hdr_string, data->len);
+ pj_hdr_string[pj_hdr_string_len] = '\0';
+
+ p = strchr(pj_hdr_string, ':');
+ if (!p) {
+ ast_log(AST_LOG_ERROR,
+ "A malformed header was returned from pjsip_hdr_print_on.\n");
+ return -1;
+ }
+
+ ++p;
+ p = ast_strip(p);
+ plen = strlen(p);
+ if (plen + 1 > data->len) {
+ ast_log(AST_LOG_ERROR,
+ "Buffer isn't big enough to hold header value. %lu > %lu\n", plen + 1,
+ data->len);
+ return -1;
+ }
+
+ ast_copy_string(data->buf, p, data->len);
+
+ return 0;
+}
+
+/*!
+ * \internal
+ * \brief Implements PJSIP_HEADER 'add' by inserting the specified header into thge list.
+ *
+ * Retrieve the header_datastore from the session or create one if it doesn't exist.
+ * Create and initialize the list if needed.
+ * Create the pj_strs for name and value.
+ * Create pjsip_msg and hdr_list_entry.
+ * Add the entry to the list.
+ */
+static int add_header(void *obj)
+{
+ struct header_data *data = obj;
+ struct ast_sip_session *session = data->channel->session;
+ pj_pool_t *pool = session->inv_session->dlg->pool;
+ pj_str_t pj_header_name;
+ pj_str_t pj_header_value;
+ struct hdr_list_entry *le;
+ struct hdr_list *list;
+
+ RAII_VAR(struct ast_datastore *, datastore,
+ ast_sip_session_get_datastore(session, header_datastore.type), ao2_cleanup);
+
+ if (!datastore) {
+ if (!(datastore = ast_sip_session_alloc_datastore(&header_datastore,
+ header_datastore.type))
+ || !(datastore->data = pj_pool_alloc(pool, sizeof(struct hdr_list)))
+ || ast_sip_session_add_datastore(session, datastore)) {
+ ast_log(AST_LOG_ERROR, "Unable to create datastore for header functions.\n");
+ return -1;
+ }
+ AST_LIST_HEAD_INIT((struct hdr_list *) datastore->data);
+ }
+
+ ast_debug(1, "Adding header %s with value %s\n", data->header_name,
+ data->header_value);
+
+ pj_cstr(&pj_header_name, data->header_name);
+ pj_cstr(&pj_header_value, data->header_value);
+ le = pj_pool_zalloc(pool, sizeof(struct hdr_list_entry));
+ le->hdr = (pjsip_hdr *) pjsip_generic_string_hdr_create(pool, &pj_header_name,
+ &pj_header_value);
+ list = datastore->data;
+
+ AST_LIST_INSERT_TAIL(list, le, nextptr);
+
+ return 0;
+}
+
+/*!
+ * \internal
+ * \brief Implements PJSIP_HEADER 'update' by finding the specified header and updating it.
+ *
+ * Retrieve the header_datastore from the session or create one if it doesn't exist.
+ * Create and initialize the list if needed.
+ * Create the pj_strs for name and value.
+ * Create pjsip_msg and hdr_list_entry.
+ * Add the entry to the list.
+ */
+static int update_header(void *obj)
+{
+ struct header_data *data = obj;
+ pjsip_hdr *hdr = NULL;
+ RAII_VAR(struct ast_datastore *, datastore,
+ ast_sip_session_get_datastore(data->channel->session, header_datastore.type),
+ ao2_cleanup);
+
+ if (!datastore || !datastore->data) {
+ ast_log(AST_LOG_ERROR, "No headers had been previously added to this session.\n");
+ return -1;
+ }
+
+ hdr = find_header((struct hdr_list *) datastore->data, data->header_name,
+ data->header_number);
+
+ if (!hdr) {
+ ast_log(AST_LOG_ERROR, "There was no header named %s.\n", data->header_name);
+ return -1;
+ }
+
+ pj_strcpy2(&((pjsip_generic_string_hdr *) hdr)->hvalue, data->header_value);
+
+ return 0;
+}
+
+/*!
+ * \internal
+ * \brief Implements PJSIP_HEADER 'remove' by finding the specified header and removing it.
+ *
+ * Retrieve the header_datastore from the session. Fail if it doesn't exist.
+ * If the header_name is exactly '*', the entire list is simply destroyed.
+ * Otherwise search the list for the matching header name which may be a partial name.
+ */
+static int remove_header(void *obj)
+{
+ struct header_data *data = obj;
+ size_t len = strlen(data->header_name);
+ struct hdr_list *list;
+ struct hdr_list_entry *le;
+ int removed_count = 0;
+ RAII_VAR(struct ast_datastore *, datastore,
+ ast_sip_session_get_datastore(data->channel->session, header_datastore.type),
+ ao2_cleanup);
+
+ if (!datastore || !datastore->data) {
+ ast_log(AST_LOG_ERROR, "No headers had been previously added to this session.\n");
+ return -1;
+ }
+
+ list = datastore->data;
+ AST_LIST_TRAVERSE_SAFE_BEGIN(list, le, nextptr) {
+ if (data->header_name[len - 1] == '*') {
+ if (pj_strnicmp2(&le->hdr->name, data->header_name, len - 1) == 0) {
+ AST_LIST_REMOVE_CURRENT(nextptr);
+ removed_count++;
+ }
+ } else {
+ if (pj_stricmp2(&le->hdr->name, data->header_name) == 0) {
+ AST_LIST_REMOVE_CURRENT(nextptr);
+ removed_count++;
+ }
+ }
+ }
+ AST_LIST_TRAVERSE_SAFE_END;
+
+ if (data->buf && data->len) {
+ snprintf(data->buf, data->len, "%d", removed_count);
+ }
+
+ return 0;
+}
+
+/*!
+ * \brief Implements function 'read' callback.
+ *
+ * Valid actions are 'read' and 'remove'.
+ */
+static int func_read_header(struct ast_channel *chan, const char *function, char *data,
+ char *buf, size_t len)
+{
+ struct ast_sip_channel_pvt *channel = ast_channel_tech_pvt(chan);
+ struct header_data header_data;
+ int number;
+ AST_DECLARE_APP_ARGS(args,
+ AST_APP_ARG(action);
+ AST_APP_ARG(header_name); AST_APP_ARG(header_number););
+ AST_STANDARD_APP_ARGS(args, data);
+
+ if (ast_strlen_zero(args.action)) {
+ ast_log(AST_LOG_ERROR, "This function requires an action.\n");
+ return -1;
+ }
+ if (ast_strlen_zero(args.header_name)) {
+ ast_log(AST_LOG_ERROR, "This function requires a header name.\n");
+ return -1;
+ }
+ if (!args.header_number) {
+ number = 1;
+ } else {
+ sscanf(args.header_number, "%30d", &number);
+ if (number < 1) {
+ number = 1;
+ }
+ }
+
+ header_data.channel = channel;
+ header_data.header_name = args.header_name;
+ header_data.header_number = number;
+ header_data.header_value = NULL;
+ header_data.buf = buf;
+ header_data.len = len;
+
+ if (stricmp(args.action, "read") == 0) {
+ return ast_sip_push_task_synchronous(channel->session->serializer, read_header,
+ &header_data);
+ } else if (stricmp(args.action, "remove") == 0) {
+ return ast_sip_push_task_synchronous(channel->session->serializer, remove_header,
+ &header_data);
+ } else {
+ ast_log(AST_LOG_ERROR,
+ "Unknown action \'%s\' is not valid, Must be \'read\' or \'remove\'.\n",
+ args.action);
+ return -1;
+ }
+}
+
+/*!
+ * \brief Implements function 'write' callback.
+ *
+ * Valid actions are 'add', 'update' and 'remove'.
+ */
+static int func_write_header(struct ast_channel *chan, const char *cmd, char *data,
+ const char *value)
+{
+ struct ast_sip_channel_pvt *channel = ast_channel_tech_pvt(chan);
+ struct header_data header_data;
+ int header_number;
+ AST_DECLARE_APP_ARGS(args,
+ AST_APP_ARG(action);
+ AST_APP_ARG(header_name); AST_APP_ARG(header_number););
+ AST_STANDARD_APP_ARGS(args, data);
+
+ if (ast_strlen_zero(args.action)) {
+ ast_log(AST_LOG_ERROR, "This function requires an action.\n");
+ return -1;
+ }
+ if (ast_strlen_zero(args.header_name)) {
+ ast_log(AST_LOG_ERROR, "This function requires a header name.\n");
+ return -1;
+ }
+ if (!args.header_number) {
+ header_number = 1;
+ } else {
+ sscanf(args.header_number, "%30d", &header_number);
+ if (header_number < 1) {
+ header_number = 1;
+ }
+ }
+
+ header_data.channel = channel;
+ header_data.header_name = args.header_name;
+ header_data.header_number = header_number;
+ header_data.header_value = value;
+ header_data.buf = NULL;
+ header_data.len = 0;
+
+ if (stricmp(args.action, "add") == 0) {
+ return ast_sip_push_task_synchronous(channel->session->serializer, add_header,
+ &header_data);
+ } else if (stricmp(args.action, "update") == 0) {
+ return ast_sip_push_task_synchronous(channel->session->serializer, update_header,
+ &header_data);
+ } else if (stricmp(args.action, "remove") == 0) {
+ return ast_sip_push_task_synchronous(channel->session->serializer, remove_header,
+ &header_data);
+ } else {
+ ast_log(AST_LOG_ERROR,
+ "Unknown action \'%s\' is not valid, Must be \'add\', \'update\', or \'remove\'.\n",
+ args.action);
+ return -1;
+ }
+}
+
+static struct ast_custom_function pjsip_header_function = {
+ .name = "PJSIP_HEADER",
+ .read = func_read_header,
+ .write = func_write_header,
+};
+
+/*!
+ * \internal
+ * \brief Session supplement callback for outgoing INVITE requests
+ *
+ * Retrieve the header_datastore from the session.
+ * Add each header in the list to the outgoing message.
+ *
+ * These pjsip_hdr structures will have been created by add_header.
+ * Because outgoing_request may be called more than once with the same header
+ * list (as in the case of an authentication exchange), each pjsip_hdr structure
+ * MUST be newly cloned for each outgoing message.
+ */
+static void outgoing_request(struct ast_sip_session *session, pjsip_tx_data * tdata)
+{
+ pj_pool_t *pool = session->inv_session->dlg->pool;
+ struct hdr_list *list;
+ struct hdr_list_entry *le;
+ RAII_VAR(struct ast_datastore *, datastore,
+ ast_sip_session_get_datastore(session, header_datastore.type), ao2_cleanup);
+
+ if (!datastore || !datastore->data) {
+ return;
+ }
+
+ list = datastore->data;
+ AST_LIST_TRAVERSE(list, le, nextptr) {
+ pjsip_msg_add_hdr(tdata->msg, (pjsip_hdr *) pjsip_hdr_clone(pool, le->hdr));
+ }
+}
+
+static struct ast_sip_session_supplement header_funcs_supplement = {
+ .method = "INVITE",
+ .priority = AST_SIP_SESSION_SUPPLEMENT_PRIORITY_CHANNEL - 1000,
+ .incoming_request = incoming_request,
+ .outgoing_request = outgoing_request,
+};
+
+static int load_module(void)
+{
+ ast_sip_session_register_supplement(&header_funcs_supplement);
+ ast_custom_function_register(&pjsip_header_function);
+
+ return AST_MODULE_LOAD_SUCCESS;
+}
+
+static int unload_module(void)
+{
+ ast_custom_function_unregister(&pjsip_header_function);
+ ast_sip_session_unregister_supplement(&header_funcs_supplement);
+ return 0;
+}
+
+AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "PJSIP Header Functions",.load =
+ load_module,.unload = unload_module,.load_pri = AST_MODPRI_APP_DEPEND,);
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