modify README.md

image_append/image_append.lua

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+local uuid      = require "resty.jit-uuid"
+local cjson     = require "cjson"
+
+local json_string = nil
+
+---- Automatic seeding with os.time(), LuaSocket, or ngx.time()
+uuid.seed()
+uuid()
+
+-- Get post json argv
+local arg = ngx.req.get_post_args()
+for k,v in pairs(arg) do
+    ngx.log(ngx.INFO , "Image append [POST] key:", k .." | ".." v:", v)
+    json_string = v
+end
+
+-- Decode json string
+local json = cjson.decode(json_string)
+ngx.say("Image append input filename number is :" , table.getn(json.data))
+local image_append_input_files_number = table.getn(json.data)
+for i = 1, image_append_input_files_number do
+    ngx.log(ngx.INFO , "Image append input filename is :" , json.data[i])
+end
+
+-- Image append
+---- Upload file save path config in nginx.conf
+local save_upload_file_path = ngx.var.store_dir
+local append_image_table = {}
+local output_image_uuid = uuid.generate_v4();
+
+-- Add path to input image filename
+for i = 1, image_append_input_files_number do
+    append_image_table[i] = save_upload_file_path .. json.data[i] .. " "
+    ngx.log(ngx.INFO, "Insert append image table "..i.." with "..append_image_table[i])
+end
+
+-- Concat input image to a command string
+local append_input_images = table.concat(append_image_table)
+ngx.log(ngx.INFO , "Input images list  : " , append_input_images)
+
+-- Add path to output image filename
+local append_output_image = save_upload_file_path .. output_image_uuid..".jpg ";
+ngx.log(ngx.INFO , "Output image is : "..append_output_image)
+
+-- Debug
+ngx.log(ngx.INFO , '/usr/local/ImageMagick/bin/magick convert -append '..append_input_images..' '..append_output_image)
+
+local call_imagemagick_cmd = io.popen('/usr/local/ImageMagick/bin/magick convert -append '..append_input_images..' '..append_output_image)
+local imagemagick_cmd_replay = call_imagemagick_cmd:read("*all")
+ngx.log(ngx.INFO , imagemagick_cmd_replay)
+
+
+
+
+
+
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+