Understanding "ZgotmplZ" in Go HTML Templates
When working with Go HTML templates, you may encounter the enigmatic string "ZgotmplZ" as output. This peculiar value has a specific meaning that demands attention.
Why ZgotmplZ Appears
"ZgotmplZ" emerges when potentially unsafe content enters a CSS or URL context during runtime. This occurs when HTML is embedded directly into CSS or URL attributes, which can introduce security vulnerabilities. To protect against these risks, the template engine inserts "ZgotmplZ" as a placeholder, preventing the unsafe content from being executed.
A Sample Example
Consider the following template code:
func printSelected(s string) string { if s == "test" { return `selected="selected"` } return "" } func main() { funcMap := template.FuncMap{ "printSelected": printSelected, "safe": func(s string) template.HTML { return template.HTML(s) }, } template.Must(template.New("Template").Funcs(funcMap).Parse(` <option printselected safe>test</option> `)).Execute(os.Stdout, nil) }
When executed, this template produces the output:
<option zgotmplz>test</option>
Securing Template Output
To ensure the safety of your template output, you can utilize "funcMap" to implement the "attr" and "safe" functions:
func attr(s string) template.HTMLAttr { return template.HTMLAttr(s) } func main() { funcMap := template.FuncMap{ "attr": attr, "safe": func(s string) template.HTML { return template.HTML(s) }, } template.Must(template.New("Template").Funcs(funcMap).Parse(` <option attr>test</option> {{.html | safe}} `)).Execute(os.Stdout, map[string]string{ "attr": `selected="selected"`, "html": `<option selected>option</option>`, }) }
This modified code results in the following output:
<option selected>test</option> <option selected>option</option>
Conclusion
By understanding the significance of "ZgotmplZ" and implementing the "attr" and "safe" functions, you can ensure that your Go HTML templates produce safe and secure output, minimizing the risk of vulnerabilities and preserving the integrity of your applications.
The above is the detailed content of Why Does My Go HTML Template Output 'ZgotmplZ'?. For more information, please follow other related articles on the PHP Chinese website!

Article discusses iterating through maps in Go, focusing on safe practices, modifying entries, and performance considerations for large maps.Main issue: Ensuring safe and efficient map iteration in Go, especially in concurrent environments and with l

The article discusses creating and manipulating maps in Go, including initialization methods and adding/updating elements.

The article discusses differences between arrays and slices in Go, focusing on size, memory allocation, function passing, and usage scenarios. Arrays are fixed-size, stack-allocated, while slices are dynamic, often heap-allocated, and more flexible.

The article discusses creating and initializing slices in Go, including using literals, the make function, and slicing existing arrays or slices. It also covers slice syntax and determining slice length and capacity.

The article explains how to create and initialize arrays in Go, discusses the differences between arrays and slices, and addresses the maximum size limit for arrays. Arrays vs. slices: fixed vs. dynamic, value vs. reference types.

Article discusses syntax and initialization of structs in Go, including field naming rules and struct embedding. Main issue: how to effectively use structs in Go programming.(Characters: 159)

The article explains creating and using pointers in Go, discussing benefits like efficient memory use and safe management practices. Main issue: safe pointer use.

The article discusses the benefits of using Go (Golang) in software development, focusing on its concurrency support, fast compilation, simplicity, and scalability advantages. Key industries benefiting include technology, finance, and gaming.


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

MantisBT
Mantis is an easy-to-deploy web-based defect tracking tool designed to aid in product defect tracking. It requires PHP, MySQL and a web server. Check out our demo and hosting services.

EditPlus Chinese cracked version
Small size, syntax highlighting, does not support code prompt function

SublimeText3 Chinese version
Chinese version, very easy to use

ZendStudio 13.5.1 Mac
Powerful PHP integrated development environment

SecLists
SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.
