Upload 2 files

server.R

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+library(shiny)
+library(readxl)
+library(stringr)
+library(openxlsx)  
+library(shinythemes)
+
+
+server <- function(input, output) {
+  # Store the original file content
+  originalFileContent <- reactiveVal(NULL)
+  
+  observeEvent(input$file, {
+    req(input$file) # Read the file content
+    
+    file_type <- switch(input$file_type,
+                        "CSV" = "csv",
+                        "XLSX" = "xlsx",
+                        "TXT" = 'txt')
+    
+    data_sheet <- tryCatch(
+      switch(file_type,
+             "csv" = {
+               sep <- if (input$csv_sep != "Other") input$csv_sep else input$csv_other
+               read.csv(input$file$datapath, sep = sep)
+             },
+             "xlsx" = {
+               tryCatch(
+                 read_xlsx(input$file$datapath, sheet = input$excel_sheet),
+                 error = function(e) {
+                   showModal(modalDialog(
+                     title = "Error",
+                     "La hoja de Excel especificada no existe en el archivo subido. Por favor, selecciona una hoja válida.",
+                     easyClose = TRUE
+                   ))
+                   return(NULL)
+                 }
+               )
+             },
+             "txt" = {
+               readLines(input$file$datapath)
+             }
+      ),
+      error = function(e) {
+        showModal(modalDialog(
+          title = "Error",
+          "El archivo no se pudo leer. Por favor, verifica que el archivo sea válido y que el tipo de archivo seleccionado sea correcto.",
+          easyClose = TRUE
+        ))
+        return(NULL)
+      }
+    )
+    
+    file_ext <- tools::file_ext(input$file$name)
+    
+    if (tolower(file_ext) != tolower(input$file_type)) {
+      showModal(modalDialog(
+        title = "Error",
+        "The file extension does not match the selected file type. Please select the correct file type or upload a file with the correct extension.",
+        easyClose = TRUE
+      ))
+      return()
+    }
+    
+    email_pattern <- "([_a-z0-9-]+(?:\\.[_a-z0-9-]+)*@[a-z0-9-]+(?:\\.[a-z0-9-]+)*(?:\\.[a-z]{2,63}))"
+    
+    correos <- c()
+    
+    switch(file_type,
+           "csv" = {
+             data_sheet <- read.csv(input$file$datapath, sep = sep)
+             
+             
+             #crete checkbox group
+             output$checkbox_group <- renderUI({
+               checkboxGroupInput("columns", "Select columns:", choices = names(data_sheet))
+             })
+             
+             observeEvent(input$columns, {
+               req(input$columns)
+               for (col_name in input$columns) {
+                 correos_raw <- na.omit(as.character(data_sheet[[col_name]]))
+                 
+                 for (entry in correos_raw) {
+                   correos_found <- str_extract_all(entry, email_pattern)[[1]]
+                   correos <- unique(c(correos, correos_found))
+                 }
+               }
+               originalFileContent(correos)
+               
+               output$contents <- renderTable({
+                 data.frame(Content = originalFileContent())
+               })
+             })
+           },
+           "xlsx" = {
+             data_sheet <- read_xlsx(input$file$datapath, sheet = input$excel_sheet)
+             
+             
+             #crete checkbox group
+             output$checkbox_group <- renderUI({
+               checkboxGroupInput("columns", "Select columns:", choices = names(data_sheet))
+             })
+             
+             
+             observeEvent(input$columns, {
+               req(input$columns)
+               for (col_name in input$columns) {
+                 correos_raw <- na.omit(as.character(data_sheet[[col_name]]))
+                 
+                 for (entry in correos_raw) {
+                   correos_found <- str_extract_all(entry, email_pattern)[[1]]
+                   correos <- unique(c(correos, correos_found))
+                 }
+               }
+               originalFileContent(correos)
+               
+               output$contents <- renderTable({
+                 data.frame(Content = originalFileContent())
+               })
+             })
+           },
+           "txt" = {
+             data_sheet <- readLines(input$file$datapath)
+             emails <- unlist(regmatches(data_sheet, gregexpr(email_pattern, data_sheet)))
+             originalFileContent(unique(emails))
+             output$contents <- renderTable({
+               data.frame(Content = originalFileContent())
+             })
+           }
+    )
+    
+    save_file <- function() {
+      file.copy(input$file$datapath, "/home/juan/Desktop/shiny_email")
+    }
+    
+    output$Download <- downloadHandler(
+      filename = function() {
+        paste(tools::file_path_sans_ext(input$file$name), "_emails", ".xlsx", sep = "")
+      },
+      content = function(file) {
+        emails_df <- data.frame(Emails = as.character(originalFileContent()))
+        write.xlsx(emails_df, file)
+      }
+    )
+    
+    output$Download2 <- downloadHandler(
+      filename = function() {
+        paste(tools::file_path_sans_ext(input$file$name), "_emails", ".txt", sep = "")
+      },
+      content = function(file) {
+        write.table(originalFileContent(), file)
+      }
+    )
+    
+  }) # End of observeEvent of file upload
+} # End of server function

ui.R

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+ui <- fluidPage(#shinythemes::themeSelector(),
+  tags$head(
+    tags$link(rel = "stylesheet", type = "text/css", href = "styles.css")
+  ),
+  
+  titlePanel("Email Extractor: "),
+  
+  sidebarLayout(
+    
+    sidebarPanel(
+      helpText("Please select the file type first, then upload your file."),
+      selectInput("file_type", "Choose File Type:", choices = c("CSV", "XLSX","TXT")),
+      fileInput("file", "Choose a File", accept = c("text/csv", "text/xlsx", 'text/txt' ,  ".csv", ".xlsx", ".txt")),
+      
+      conditionalPanel(
+        condition = "input.file_type == 'CSV'",
+        selectInput("csv_sep", "CSV Separator:", choices = c("Comma" = ",", "Semicolon" = ";", "Tab" = "\t", "Space" = " ", "Other" = "Other")),
+        textInput('csv_other', 'Other Separator:', ',')
+      ),
+    
+      conditionalPanel(
+        condition = "input.file_type == 'XLSX'",
+        numericInput("excel_sheet", "Excel Sheet Number:", 1)
+      ),
+      
+      uiOutput("checkbox_group"), 
+      downloadButton("Download", "Download xlsx", icon = icon("download"), class = 'DESCARGA1'),
+      downloadButton("Download2", "Download txt", icon = icon("download"), class = 'DESCARGA2')
+    ), # End of sidebarPanel
+    # Show the content of the file
+    mainPanel(
+      tableOutput("contents")
+    ) # End of mainPanel
+  ), # End of sidebarLayout
+  #tuturial panel
+  mainPanel(
+    h2("Tuturial:"),
+    p("This app is designed to extract email addresses from different file types."),
+    p("Please select the file type first, then upload your file."),
+    p("If you choose CSV or TXT, you can select the separator."),
+    p("If you choose XLSX, you can input the sheet number."),
+    p("After you upload the file, you can download the extracted email addresses in xlsx and txt format.")
+  ) # End of mainPanel
+)  # End of fluidPage