b38dea0597
Share Gaia assets and adapters, keep private profiles and development documents local, and update both public READMEs.
29 lines
No EOL
3.4 KiB
JavaScript
29 lines
No EOL
3.4 KiB
JavaScript
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(function(exports){if(exports.ForwardLock){return;}
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const mimeSubtype='vnd.mozilla.oma.drm.fl';const SECRET_SETTINGS_ID='oma.drm.forward_lock.secret.key';var secret=null;function xor(buffer,key){var words=new Uint32Array(buffer,0,buffer.byteLength>>2);for(var i=0,n=words.length;i<n;i++){words[i]^=key;}}
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function lockBuffer(secret,content,type,metadata){var header='LOCKED 1 '+escape(type)+'\n';if(metadata){for(var p in metadata){header+=escape(p)+':'+escape(metadata[p])+'\n';}}
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header+='\0';var buffer=new Uint8Array(new Uint8Array(content)).buffer;xor(buffer,secret);return new Blob([header,buffer],{type:type.split('/')[0]+'/'+mimeSubtype});}
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function lockBlob(secret,blob,metadata,callback){var reader=new FileReader();reader.readAsArrayBuffer(blob);reader.onload=function(){callback(lockBuffer(secret,reader.result,blob.type,metadata));};}
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function unlockBlob(secret,blob,callback,errorCallback){if(!secret){return error('no secret supplied');}
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var reader=new FileReader();reader.readAsArrayBuffer(blob);reader.onload=function(){var buffer=reader.result;var bytes=new Uint8Array(buffer);var header='';var contentStart;for(var i=0;i<bytes.length;i++){if(bytes[i]===0){contentStart=i+1;break;}
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header+=String.fromCharCode(bytes[i]);}
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if(!header.startsWith('LOCKED')){return error('Bad magic number');}
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if(header.substring(6,9)!==' 1 '){return error('Unsupported version number');}
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if(!contentStart){return error('No content');}
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var eol=header.indexOf('\n');if(eol===-1){return error('malformed header');}
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var type=unescape(header.substring(9,eol).trim());var metadata={};var lines=header.substring(eol+1).split('\n');for(var j=0;j<lines.length;j++){var line=lines[j];if(!line){continue;}
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var[key,value]=line.split(':');if(!key||!value){return error('malformed metadata');}
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metadata[unescape(key)]=unescape(value);}
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var content=buffer.slice(contentStart);xor(content,secret);var blob=new Blob([content],{type:type});try{callback(blob,metadata);}
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catch(e){console.error('Exception in content callback',e);}};function error(msg){msg='LCKA.decrypt(): '+msg;if(errorCallback){try{errorCallback(msg);}
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catch(e){console.error('Exception in error callback',e);}}
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else{console.error(msg);}}}
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function getKey(callback){try{if(secret!==null){report(secret);return;}
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var lock=navigator.mozSettings.createLock();var getreq=lock.get(SECRET_SETTINGS_ID);getreq.onsuccess=function(){secret=getreq.result[SECRET_SETTINGS_ID]||null;report(secret);};getreq.onerror=function(){console.error('Error getting ForwardLock setting',getreq.error);report(null);};}
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catch(e){console.error('Exception in ForwardLock.getKey():',e);report(null);}
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function report(secret){if(callback){try{callback(secret);}
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catch(e){console.error('Exception in ForwardLock.getKey() callback',e);}}}}
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function getOrCreateKey(callback){getKey(function(key){if(key!==null){report(key);return;}
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secret=((Math.random()*0xFFFFFFFF)|0)+1;var setting={};setting[SECRET_SETTINGS_ID]=secret;var setreq=navigator.mozSettings.createLock().set(setting);setreq.onsuccess=function(){report(secret);};setreq.onerror=function(){console.error('Failed to set key in ForwardLock.getOrCreateKey()',setreq.error.name);secret=null;};});function report(secret){if(callback){try{callback(secret);}
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catch(e){console.error('Exception in ForwardLock.getOrCreateKey() callback');}}}}
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exports.ForwardLock={lockBuffer:lockBuffer,lockBlob:lockBlob,unlockBlob:unlockBlob,mimeSubtype:mimeSubtype,getKey:getKey,getOrCreateKey:getOrCreateKey};}(window)); |