[SR-Users] JSON error - control character 0xd

[Alex Balashov]

Your best bet is probably to run this through an embedded Python script or similar which exposes a chr() type function. 

—
Sent from mobile, with due apologies for brevity and errors.

> On Apr 21, 2019, at 4:14 PM, David Dean <just_bytesize at yahoo.co.uk> wrote:
> 
> I tried using s.replace to replace the control characters, but I don't think it recognises them:
> 
> $avp(sdp) = $(avp(sdp){s.replace,#015#012,\r\n});
> 
> It's the "#015#012" which is coming from sdp_get("$avp(sdp)"); that is the problem.
> 
> On Sunday, 21 April 2019, 20:40:34 BST, David Dean <just_bytesize at yahoo.co.uk> wrote:
> 
> 
> Agreed. Unfortunately Janus doesn't accept base64 at this time.
> 
> I'll ask Lorenzo whether he can add base64 support, but in the interim I need to find a way in Kamailio of parsing $avp(sdp) as shell escaped plain text with the control characters replaced.
> 
> Thanks.
> 
> 
> On Sunday, 21 April 2019, 19:21:13 BST, Alex Balashov <abalashov at evaristesys.com> wrote:
> 
> 
> A common solution to these problems is to base64-encode SIP data, so as
> to avoid any part of SIP grammar violating JSON encoding specs or
> conflicting with a JSON delimiter. 
> 
> However, I'm not sure if whatever Janus is will accept that.
> 
> On Sun, Apr 21, 2019 at 06:15:22PM +0000, David Dean wrote:
> 
> > I'm trying to send an SDP from a SIP client to Janus using JSON over HTTP.
> > The problem is that Janus is erroring on the SDP content with the following error:
> > 
> > JANUS HTTP: Get SDP for echo plugin: {#012   "janus": "error",#012   "error": {#012      "code": 454,#012      "reason": "JSON error: on line 9: control character 0xd near '\"v=0'"#012   }#012} Result code 200
> > 
> > I tried using {s.escape.common} to escape any quotations, commas etc but it doesn't appear to replace the control characters with newlines.
> > Any suggestions on how best to remove these control characters so that Janus will accept the SDP over JSON?
> > Here is the relevant section of kamailio.cfg:
> > 
> > # HTTP: Request SDP for echo test plugin                sdp_get("$avp(sdp)");
> >                 $var(res) = http_connect("janus", "/janus/$var(JANUS-ID)/$var(ECHO-ID)", "application/json", "{        \"janus\" : \"message\",        \"transaction\" : \"testtesttest99\",        \"body\" : {                \"audio\" : true        },        \"jsep\" : {                \"type\" : \"offer\",                \"sdp\" : \"$(avp(sdp){s.escape.common})\"        }}", "$avp(janus-pluginsession)");                xlog("L_INFO", "JANUS HTTP: Get SDP for echo plugin: $avp(janus-pluginsession) Result code $var(res)\n");
> 
> > 
> > 
> 
> > _______________________________________________
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> 
> 
> -- 
> Alex Balashov | Principal | Evariste Systems LLC
> 
> Tel: +1-706-510-6800 / +1-800-250-5920 (toll-free) 
> Web: http://www.evaristesys.com/, http://www.csrpswitch.com/
> 
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