增加图片验证码生成业务逻辑相关文件，并编写接口用于测试使用

conf/system/system.conf

@@ -48,6 +48,11 @@ location /yum/v1/system/users {
     content_by_lua_file '${APP_PATH}/src/api/system/user.lua';
 }
 
+#登陆时图片验证码相关
+location /yum/v1/system/captcha {
+    content_by_lua_file '${APP_PATH}/src/api/system/captcha.lua';
+}
+
 ######################################################
 ###     oauth2.0 + openIDC 接口文件处理              ###
 ######################################################

src/api/system/captcha.lua

@@ -0,0 +1,43 @@
+---
+--- Generated by EmmyLua(https://github.com/EmmyLua)
+--- Created by admin.
+--- DateTime: 2025/11/21 11:50
+--- 验证码图片接口
+
+--解析url路由过滤库
+local radix = require("resty.radixtree")
+--数据表业务处理
+local systemCaptcha = require("service.system.captcha")
+
+--定义相关路由，前端接口url地址
+local routes = {
+    --验证码图片相关路由接口
+    {
+        paths = { "/yum/v1/system/captcha" },
+        methods = { "GET" },
+        handler = systemCaptcha.getCaptcha,
+    },
+}
+
+-- 初始化路由
+local rx, err = radix.new(routes)
+if not rx then
+    ngx.say("Not Found")
+    ngx.exit(ngx.HTTP_NOT_FOUND)
+end
+
+--获取访问的uri地址
+local uri = ngx.var.uri
+local opts = {
+    host = ngx.var.host,
+    method = ngx.var.request_method,
+    remote_addr = ngx.var.remote_addr,
+    matched = {}
+}
+
+-- 进行路由匹配和相关函数调用
+local ok = rx:dispatch(uri, opts, opts.matched)
+if not ok then
+    ngx.say("Not Found")
+    ngx.exit(ngx.HTTP_NOT_FOUND)
+end

src/service/system/captcha.lua

@@ -0,0 +1,44 @@
+---
+--- Generated by EmmyLua(https://github.com/EmmyLua)
+--- Created by admin.
+--- DateTime: 2025/11/21 11:55
+--- 验证码相关函数
+
+local _M = {}
+
+local status = require("util.status")
+local resp = require("util.response")
+local genpic = require("util.generatechaptcha")
+local red = require("share.redis")
+
+--生成图片文件
+function _M.getCaptcha()
+    local filename, base64_data, captchaText = genpic.get_captcha_base64()
+    --将文件名存储到redis中 超时时间5分钟
+    local key = "captcha-"..filename
+    red:set(key, captchaText)
+    red:expire(key, 5 * 60)
+
+    -- 4.返回结果
+    local ret = {
+        picgid = filename,
+        pic = base64_data
+    }
+    resp:response(status.SUCCESS, ret)
+end
+
+--验证图片上的验证码
+function _M.checkCaptcha()
+
+end
+
+--验证码删除
+function _M.deleteCaptcha()
+    --获取请求中参数
+    local args = ngx.req.get_uri_args()
+    --其中image为要删除的验证码图片的picgid。
+    local picgid = args["picgid"]
+    red:del(picgid)
+end
+
+return _M

src/util/generatechaptcha.lua

@@ -12,54 +12,66 @@ local _M = {}
 --在32个备选字符中随机筛选4个作为captcha字符串
 local dict = {'A','B','C','D','E','F','G','H','J','K','L','M','N','P','Q','R','S','T','U','V','W','X','Y','Z','2','3','4','5','6','7','8','9'}
 
-function _M.getChaptcha()
-    local stringmark = ""
-    for i = 1, 4 do
-        stringmark = stringmark..dict[math.random(1,32)]
-    end
-
+-- 生成验证码图片
+local function generate_captcha()
     --图片基本info
     local uid = uuid.generateUuid()
     --picgid
-    local filename = "1"..uid..".png"
+    local filename = uid
     --图片78x26
-    local xsize = 78
-    local ysize = 26
-    --字体大小
-    local wsize = 17.5
-    --干扰线(yes/no)
-    local line = "yes"
+    local width = 78
+    local height = 26
+    -- 创建画布
+    local im = gd.createTrueColor(width, height)
 
-    --创建面板
-    local im = gd.createTrueColor(xsize, ysize)
-    --定义颜色
+    -- 设置背景色（白色）
+    local white = im:colorAllocate(255, 255, 255)
+    im:filledRectangle(0, 0, width, height, white)
+
+    -- 设置文本颜色（黑色）
     local black = im:colorAllocate(0, 0, 0)
-    local grey = im:colorAllocate(202, 202, 202)
-    local color = {}
-    for c = 1, 100 do
-        color[c] = im:colorAllocate(math.random(100), math.random(100), math.random(100))
+
+    -- 生成随机验证码（4位数字字母）
+    math.randomseed(os.time())
+    local captcha_text = ""
+    for i = 1, 4 do
+        captcha_text = captcha_text..dict[math.random(1,32)]
     end
-    --画背景
-    x, y = im:sizeXY()
-    im:filledRectangle(0, 0, x, y, grey)
-    --画字符
+    -- 在图片上绘制验证码文本
     gd.useFontConfig(true)
     for i = 1, 4 do
-        k = (i - 1) * 16 + 3
-        im:stringFT(color[math.random(100)], "Arial:bold", wsize, math.rad(math.random(-10,10)), k, 22, string.sub(stringmark, i, i))
+        local char = string.sub(captcha_text, i, i)
+        local x = 10 + (i-1)*25 + math.random(-5,5)
+        local y = 10 + math.random(-5,5)
+        local angle = math.random(-20, 20)
+        im:stringFT(black, "Arial:bold", 18, angle, x, 30, char)
     end
-    --干扰线点
-    if line == "yes" then
-        for j = 1, math.random(3) do
-            im:line(math.random(xsize), math.random(ysize), math.random(xsize), math.random(ysize), color[math.random(100)])
+    -- 添加干扰线
+    for i = 1, 5 do
+        local line_color = im:colorAllocate(math.random(0,255), math.random(0,255), math.random(0,255))
+        im:line(math.random(0, height), math.random(0, width), math.random(0,height), math.random(0, width), line_color)
     end
-        for p = 1, 20 do
-            im:setPixel(math.random(xsize), math.random(ysize), color[math.random(100)])
+    -- 添加噪点
+    for i = 1, 100 do
+        local dot_color = im:colorAllocate(math.random(0,255), math.random(0,255), math.random(0,255))
+        im:setPixel(math.random(0, height), math.random(0, width), dot_color)
     end
+    -- 将图片转换为PNG格式的二进制数据
+    local png_data = im:pngStr(75)
+    return filename, captcha_text, png_data
 end
-    --流输出
-    local fp = im:pngStr(75)
-    return filename, fp
+
+-- 生成验证码并返回Base64编码
+function _M.get_captcha_base64()
+    local filename, captcha_text, png_data = generate_captcha()
+
+    if not png_data then
+        ngx.log(ngx.ERR, "Failed to generate captcha image")
+        return nil, nil, nil
+    end
+    -- 对图片数据进行Base64编码
+    local base64_data = ngx.encode_base64(png_data)
+    return filename, base64_data, captcha_text
 end
 
 return _M