rules | 易学教程

Firebase: Security rules for a collaborative app

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问题 I'm writing a note sharing app and I'm trying to find the best approach for the data structure to allow adding collaborators to user notes, while at the same time having sensible security rules for the structure in question. What I have now is the following: "users": { "johndoe": { "notes": { "note1Key", "note2Key" } }, "jane": { "notes": { "note3Key", "note4Key", "note5Key" } } ... }, "notes": { "note1Key": { // actual note data }, "note2Key": { // actual note data }, "note3Key": { // actual

Default rules in Make

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问题 Is there a mechanism in make to allow for default global implicit rules that are available anywhere, similar to the built-in rules? Make provides some built-inimplicit rules for compiling C/C++/Fortran files, without even requiring a Makefile for simple cases. However, when compiling other languages (e.g. Go programming language files), a Makefile is always required. I would like to extend my Makeenvironment to have implicit rules available by default. 回答1: This is not normally desirable, as

Extended Backus–Naur Form order of operations

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问题 I am creating a formal spec for a very simple rule language, very simple. I want to use EBNF as this is a standard but I can't figure out how to specify order of operations. Here is the specification so far. rule = statement, { (‘AND’|’OR’), statement}; variable = ‘$’,alphabetic character, {alphabetic character | digit}; statement = variable, [ ‘count’,[white space ],’>’,[white space],number ]; alphabetic character = "A" | "B" | "C" | "D" | "E" | "F" | "G" | "H" | "I" | "J" | "K" | "L" | "M"

How does Tomcat maintain session integrity?

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问题 HttpServletRequest 's getSession(boolean) method mentions session integrity. How does Tomcat maintains session integrity? What rules does it use? What method? What is happening under the hood precisely? EDIT How and when is a specific session ID is created? Does Tomcat rely on IP address and port for example? 回答1: In Tomcat the ManagerBase.generateSessionId() method is responsible for session id generation. It looks for me that session ids are generated based on random numbers. You can store

CSS rules specificity

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问题 How can I count the rule specificity in CSS? I know the basic things (1000 for style, 100 for id, 10 for att/class, etc.) However, I still get stuck too many times with simple things, example: How much would this be? <div class="wrapper"> <div class="inner"></div> </div> .wrapper > div /* ??? */ .inner /* 10 */ The first rule is applied, obviously. But how much is it? 回答1: Basically, it's like this: !important styles always override all other styles, but amongst !important styles, specificity

R: building text Classifier

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问题 I have content set that has to be classified based on few rules . sample data: 1 chin jeffrey hong kong wednesday october global business reporting cc subramanian raghuveer kumar m santhosh antoo ramesh subject request obtain global icis data dear team appreciate can distribute monthly basis latest global icis data ramesh antoo upon availability regards jeffrey chin associate business risk strategy efficiency brse asia international institutional banking australia new zealand banking group

Avoid create extra childs Firebase

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问题 Im a new in firebase and I wish to know how to figure out a question regarding to hasChildren() RuleDataSnapshot and how validates the data will be created. Sample of db : { "visitors" : { "-KP4BiB4c-7BwHwdsfuK" : { "mail" : "aaa@mail.com", "name" : "aaa", } ..... } Rules : { "rules": { "visitors": { ".read": "auth != null", ".write": "auth.uid != null", "$unique-id": { ".read": "auth != null ", ".write": "auth != null", ".validate": "newData.hasChildren(['name','mail'])", } } } } As far I

Yii CModel中rules验证规则[转]

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Yii CModel中rules验证规则[转] array(‘username’, ‘required’), array(‘username’, ‘length’, ‘min’=>3, ‘max’=>12), array(‘password’, ‘compare’, ‘compareAttribute’=>’password2′, ‘on’=>’register’), array(‘password’, ‘authenticate’, ‘on’=>’login’), array(‘Price’,'numerical’, ‘integerOnly’=>true), ); public function rules() { return array( array(‘title, content, status’, ‘required’), array(‘title’, ‘length’, ‘max’=>128), array(‘status’, ‘in’, ‘range’=>array(1,2,3)), array(‘tags’, ‘match’, ‘pattern’=>’/^[\w\s,]+$/’, ’message’=>’Tags can only contain word characters.’), array(‘tags’, ‘normalizeTags’), array(

Data Driven Rules Engine - Drools

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问题 I have been evaluating Drools as a Rules Engine for use in our Business Web Application. My use case is a Order Management Application. And the rules are of following kind: - If User Type is "SPECIAL" give an extra 5% discount. - If User has made 10+ Purchases already, give an extra 3% discount. - If Product Category is "OLD", give a Gift Hamper to the user worth $5. - If Product Category is "NEW", give a Gift Hamper to the user worth $1 - If User has made purchases of over $1000 in the past,

Firebase user read all, write new, but only modify his own data

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问题 I have the next scenario on Firebase: There are 2 things, Users and events . I would like the Users to be able to create new Events , see all the existing events but be only able to modify only the events that were created by them. Meaning that UserOne created EventOne, can see EventOne and EventTwo, but can only modify EventOne. My structure is as follows: -events -eventOne endTime: id: name: providerId: startTime: userId: -eventTwo endTime: id: name: providerId: startTime: userId: -users